Tuesday, July 20, 2021

THE AIM IS GROSSE POINTE ZERO
Net zero is hard work, so companies are going ‘carbon neutral’

Bloomberg News | July 19, 2021 | 

Projects that truly reduce deforestation are key to climate change. Stock image.

Companies are buying carbon offsets like never before. They’re also facing unprecedented scrutiny over whether helping to fund green projects elsewhere really makes up for their heat-trapping emissions.


The most common offsets are based on avoiding the release of additional carbon dioxide into the atmosphere, for example by preventing deforestation or supporting renewable energy projects. The other, much more expensive, option is to fund programs that actually remove CO₂ by planting forests or employing machines that capture greenhouse gas from the air and store them away. Should companies be allowed to use cheaper “avoided emissions” to deliver on their promises to eliminate pollution?




The Science Based Targets initiative, a group of well-respected experts on corporate claims, says no. A company cannot offset its way to net-zero emissions because it undermines the need for investment in structural changes to cut pollution, according to its guidance. Instead, the group says, carbon-removal credits should only be bought once all other possible practical angles have been explored, such as switching to cleaner fuels or investing in new technology. Companies can still buy all the avoided-emissions offsets they want — they just can’t use them to balance their carbon ledgers.

That is too high a bar for some companies, which argue they should get some kind of recognition for purchasing offsets. If the credits can’t be used to improve their green credentials, then what’s the point of having them at all? That’s why some are proposing a compromise. Maybe companies can use offsets to claim “carbon neutrality” rather than “net zero.”

The idea is backed by Mark Carney, the former governor of the Bank of England, who is spearheading the Taskforce for Scaling Voluntary Carbon Markets. The group’s final recommendations on July 9 suggested an offset buyer could be described as “carbon neutral” or “carbon neutral on the path to net zero.”

“There’s a difference between carbon neutrality and net zero,” Carney told members of the British Parliament earlier this month. “The company should be compensating for its emissions on that pathway to net zero as well.”

Yet the two terms are indistinguishable to anyone who isn’t familiar with the intricacies of carbon accounting — itself a nascent financial tool. The push to adopt the “carbon neutral” label is causing concern among climate experts, who fear it creates a watered-down definition for those who are more interested in greenwashing than genuinely seeking to reach net zero.

“There will be some companies that try to scrape by with avoided-emission offsets,” said Eli Mitchell-Larson, an Oxford University environmental scientist who sits on the taskforce. “There needs to be a term for them.” But both “net zero” and “carbon neutral” are defined by the United Nations and scientists as the balance of emissions with removals, he said, “so carbon neutral is technically just shorthand for net zero.”


RELATED: Carbon offset trading is taking off before any rules are set

Owen Hewlett, another taskforce member and chief technology officer of Gold Standard, an offset registry, said there’s no consensus over what “carbon neutral” means. Still, he said, it would be good to find a way to differentiate between faraway milestones like “net zero” and shorter-term claims that are based on supporting programs that avoid more emissions.

Environmentalists broadly agree that well-run projects that, say, truly reduce deforestation are a key climate solution. Many are eager for more money to flow to these avoided-emissions programs, which are often underfunded in developing countries. What they struggle with is how to move large amounts of corporate money through a voluntary carbon market in return for some sort of credit to the company.

Assuming the projects are effective at avoiding emissions, should customers and investors accept the credits as suitable penance for a company’s climate sins? The answer could have ripple effects for years to come on efforts to slow global warming. If we agree that avoided emissions are sufficient to cancel out ongoing pollution, we give companies a license to keep polluting as long as they purchase these credits.

Perhaps a better label for companies using avoided-emissions offsets should be something closer to “carbon responsible.”

Only a small fraction of corporations has a climate plan. An even smaller group has science-based targets endorsed by SBTi. If companies want to atone for their climate sins, they can begin by taking responsibility for their pollution by funding avoided-emissions programs. That doesn’t write off emissions from their carbon ledgers, but it could earn them a “carbon responsible” tag that gives them credit for being ahead of the vast majority of firms that don’t even have a roadmap for reducing emissions.

If these companies really want to cancel out emissions with offsets, they would have to purchase more expensive carbon-removal credits that actually draw down greenhouse gases. Only when companies have achieved all the reductions they possibly can, and balanced the rest with carbon removals, would they achieve “carbon-neutrality” or reach “net zero.”

(By Jess Shankleman and Akshat Rathi)
Vale reviews copper, nickel guidance amid labor, climate issues

Reuters | July 19, 2021 | 

Teluk Rubiah distribution terminal (Credit: Vale)

Brazilian miner Vale SA said on Monday evening that it was reviewing its guidance for 2021 nickel and copper output as strikes and “extraordinary climate conditions” in Canada have materially affected production.


In its second quarter output report, Vale said it produced 41,500 tonnes of nickel in the period and 73,500 tonnes of copper, representing quarterly declines of 14.3% and 4%, respectively.

A union walk off at Vale’s mine in Sudbury, Canada, that started on June 1, is hitting production for both metals, the company said. Additionally, non-scheduled maintenance at a metals refinery in Wales was constraining nickel output, and a flood at its Voisey’s Bay assets in Labrador, Canada, hit copper output.

“(Copper) production was hit mainly by the Sudbury strike and delays at Voisey’s Bay resulting from the flooding of the mine, related principally to extraordinary climate conditions,” the company said, adding that the flooding had since subsi
ded.

The company said that production of iron ore, the core of its business, had come in at 75.7 million tonnes in the second quarter, up 11.3% in quarterly terms and 12% in annual terms. Among several factors that buoyed iron ore output, the company said, was the completion of maintenance at the Ponta da Madeira port in northern Brazil. The miner maintained its 2021 iron ore production guidance of 315-335 million tonnes.

(By Gram Slattery, Marta Nogueira and Gabriel Stargardter; Editing by Rosalba O’Brien and Aurora Ellis)
ONTARIO
Barrick says Hemlo suspended following a fatality

MINING.com Editor | July 16, 2021 | 

Barrick has reported a fatality at the Hemlo underground mine in Ontario. Credit: Barrick Gold

Operations at Barrick Gold’s (TSX: ABX; NYSE: GOLD) Hemlo mine, about 350 kilometers east of Thunder Bay, Ontario, remain suspended after a contract worker died on site late Wednesday.


Perenti, through its subsidiary Barminco, provides underground mining services to the Hemlo gold mine.

BARMINCO AND BARRICK ARE WORKING CLOSELY WITH THE LABOUR MINISTRY AND THE ONTARIO PROVINCIAL POLICE TO INVESTIGATE THE CAUSE OF THE ACCIDENT

Barminco and Barrick are working closely with the labour ministry and the Ontario Provincial Police to investigate the cause of the accident.

CBC News reports the OPP has identified the deceased as Troy Cameron of the nearby town of Marathon.

“Perenti and Barrick extend their deepest sympathies to the family, friends and colleagues of the employee,” Barrick said in the statement.

Counselling services have been mobilized to provide direct support to the employee’s family and co-workers.

Hemlo has produced more than 21 million oz. of gold, and has been operating continuously for more than 30 years. It comprises the Williams mine—an underground and open pit operation.

The mine has now transitioned to underground only.

According to Barrick’s recent preliminary production results, Hemlo produced 42,000 oz. in the June quarter, 22% less year-on-year from 54,000 oz. in the comparable prior-year period.

Barrick has guided for Hemlo to contribute 200,000 to 220,000 oz. gold in 2021.

 Lebanon: Can youth bring about radical reform? | Generation Change

Jul 19, 2021

Al Jazeera English

In the third episode of Generation Change, we travel to Lebanon to see how young organisers are mobilising to halt one of the most serious economic and political crises in Lebanon’s history.

Karim Safieddine is an activist and leading member of MADA, Lebanon’s first youth-led political movement.

Azza el-Masri is a journalist and media researcher specialising in disinformation and its effects on sectarianism.

In this episode, presented by Luna Safwan, Karim and Azza discuss Lebanon’s political gridlock, the August 4 Beirut blast, as well as strategies to end corruption and dismantle the sectarian power-sharing system.



Unilever partners with Arzeda on enzymes for cleaning

The start-up’s digital biology platform combines biophysics with artificial intelligence

by Craig Bettenhausen
July 13, 2021


Credit: Arzeda
Arzeda uses biophysics, big data, and artificial intelligence to design enzymes, such as this hydrolase.

The enzyme development start-up Arzeda has landed a partnership with the consumer goods giant Unilever to develop enzymes for household cleaning applications.

Many dish detergents and hard surface cleaners already use enzymes, which can break down soils, oils, and other grime as well as boost the performance of other ingredients. Enzymes, along with live microbes and advanced surfactants, are central to Unilever’s $1.2 billion plan to shift to 100% biobased ingredients for its cleaning products by 2030.

Neil Parry, head of biotechnology development at Unilever, says the firm has the opportunity with Arzeda to look beyond the capacities of natural enzymes and into new kinds of enzyme-catalyzed cleaning chemistry. “Although detergents have been around for a long time with enzymes in them, the enzyme classes are quite limited,” he says, “and we believe there’s so many more enzyme classes that can get performance.”

Parry says Unilever is interested both in enzymes that are part of final consumer products, like lipases that break down grease in dish detergent, and those that improve the company’s manufacturing processes, such as the saponification of oils and fats into soaps.

Arzeda combines physics-based protein design with deep learning, a type of artificial intelligence, to improve enzymes or even build them from scratch. “Our impact on the field of enzyme engineering is improving the manufacturability and performance of existing classes, and then creating new classes of function, new modes of action,” says Alexandre Zanghellini, Arzeda’s founder and CEO.

Parry says the venture is part of Unilever’s goal of eliminating petroleum-derived ingredients. “You start taking the chemical load away; what are you going to replace it with?” he says. “This is making sure that the enzyme classes go across the different functionalities that petrochemicals give us today.”

Though the firms declined to discuss the financial details of the 3-year collaboration, Parry and Zanghellini both describe the scale as “significant.” Zanghellini says it fits well with his strategy of working closely with a small number of market leaders. “We have a couple of key partners which are making significant commitments, not only on the financial side but also on bringing these products to market,” he says. For example, Arzeda is working with Amyris and BP on biobased chemicals.

Arzeda raised $15.2 million in a series A funding round in 2017, and Zanghellini says the company has invested around $30 million overall in developing its platform and technology. The Seattle-based firm employs roughly 40 people “and is growing rapidly,” he says. About 35% of its research staff comes from a computer science background and the rest from chemistry and biology.

Enzymes are a hot area for chemical manufacturing. Just this year, DSM began testing enzymatic production of food and flavor ingredients with the start-up Debut Biotechnology, the start-up Allozymes raised $5 million for its droplet-microfluidics-based enzyme screening technology, and the start-up EnginZyme raised $13 million for its immobilized-enzyme chemical synthesis platform.

Chemical & Engineering News
ISSN 0009-2347
Copyright © 2021 American Chemical Society



NATURAL PRODUCTS

Delta-8-THC craze concerns chemists

Unidentified by-products and lack of regulatory oversight spell trouble for cannabis products synthesized from CBD

by Britt E. Erickson
July 6, 2021 | A version of this story appeared in Volume 99, Issue 31

Credit: Maurice Keller
Signs for delta-8-THC products are increasingly showing up on street corners and in windows of retail stores.



Move over cannabidiol (CBD). The popularity of another cannabinoid, ∆8-tetrahydrocannabinol (delta-8-THC), is on the rise. Found in gummies, vape cartridges, tinctures, and other products, delta-8-THC is popping up in gas stations, convenience stores, tobacco shops, and cannabis dispensaries throughout the US and beyond—often with no age restrictions.


The conversion of cannabidiol into delta-8-tetrahydrocannabinol (delta-8-THC) also produces small amounts of delta-9-THC and delta-10-THC.

Unlike CBD, delta-8-THC produces euphoric effects that are similar to but milder than those of delta-9-THC, the well-known psychoactive compound in cannabis. Delta-8-THC is an isomer of delta-9-THC. The only difference between the two molecules is the location of a double bond between two carbons.

The delta-8-THC craze began when an oversupply of CBD extracted from US-grown hemp caused the price of CBD to plummet. Producers began looking for ways to turn the glut of CBD into something profitable. Using simple chemistry reported in the 1960s, the industry got creative and started experimenting with ways to convert CBD into delta-8-THC. The resulting products target consumers who are looking to relieve stress and anxiety, especially those who don’t want to use traditional cannabis products or those who live in places where cannabis products are not legally available.

But with no regulatory oversight and limited laboratory testing, most products sold as delta-8-THC are not actually pure delta-8-THC. Such products typically contain a high percentage of delta-8-THC and small amounts of other cannabinoids, including delta-9-THC, and reaction by-products. Some of the cannabinoids are not naturally found in cannabis. In most cases, nothing is known about the health effects of these impurities.

Several states are starting to crack down on sales of delta-8-THC products. But as long as they are derived from hemp and contain no more than 0.3% of delta-9-THC on a dry-weight basis—the limit under federal law—many lawyers and hemp industry officials consider them legal. Regardless of whether delta-8-THC is legal, chemists are sounding the alarm after finding several unidentified compounds in products labeled as delta-8-THC.

SAFETY CONCERNS SKYROCKET


“My concern is that we have no idea what these products are,” says Christopher Hudalla, president and chief scientific officer of ProVerde Laboratories, an analytical testing firm with facilities in Massachusetts and Maine. “Consumers are being used as guinea pigs. To me, that’s horrific,” he says.

Using chromatographic methods with UV or mass spectrometry detection, scientists at ProVerde have tested thousands of products labeled delta-8-THC. “So far, I have not seen one that I would consider a legitimate delta-8-THC product,” Hudalla says. “There’s some delta-8-in there, but there’s very frequently up to 30 [chromatographic] peaks that I can’t identify.” There are often also peaks that correlate with delta-9-THC as well as another isomer, delta-10-THC, he notes. Little is known about the effects of delta-10-THC, but users have anecdotally reported feeling euphoric and more focused after consuming it.


Credit: Michael Coffin
Vape cartridges containing both delta-8-THC and delta-10-THC can be purchased in many retail stores and online.


“I’m less concerned with traditional THC isomers than I am of the ubiquitous unknowns,” says Michael Coffin, chief scientist at Elevation Distro, a California-based cannabis manufacturing and distribution firm. “Delta-8, delta-9, and even delta-10 don’t seem to have any ill effects on people that we know of at this point,” he says. But a lot of people are doing a poor job of cleaning up their reaction products, he adds, which results in “quite a soup” of by-products and other unwanted compounds.

The conversion of CBD to delta-8-THC involves refluxing CBD in an organic solvent, such as toluene or heptane, with p-toluenesulfonic acid or another acid that serves as a catalyst. The reaction is typically run for 60–90 min. “You basically close the ring on the CBD molecule,” Coffin says.

“These are pretty aggressive synthetic conditions that use strong acids,” Hudalla says. “They might be using strong bases to neutralize. They can use metal catalysts. I hear different people doing it different ways.” In a pharmaceutical environment, PhD chemists ensure that products don’t include harmful unconsumed reactants, he says. But nobody is measuring the pH of delta-8 products or testing for strong acids and residual metals that are left behind, he says.

It is possible to separate delta-8-THC from unwanted reaction leftovers or by-products, but “most people are not actually taking the time to distill it or use chromatography” to do so, says Kyle Boyar, a staff research associate at the University of California San Diego’s Center for Medicinal Cannabis Research.

One by-product commonly found in delta-8-THC products is olivetol, a precursor of THC, Boyar says. “There’s a patent for olivetol oral compositions” that inhibit cannabis intoxication from delta-9 THC, he says. If olivetol also inhibits intoxication from delta-8, it may contribute to the perceived milder effects of that isomer. The patent applies to an oral dose of olivetol. “I don’t think anybody really knows the safe inhalation dose of olivetol,” he adds.

“A lot of irresponsible production is going on in the sense that most of these people are getting their information from online forums, and many of them aren’t necessarily trained chemists,” Boyar says.

Like many other scientists, Greg Gerdeman, president and acting CEO of NASHCX, a Nashville-based commodities exchange devoted to hemp and its derivative products, is concerned about the lack of oversight for delta-8-THC products. “It really needs to be cleaned up,” he says. “I just know there’s a great deal of experimentation,” by producers. And despite claims of delta-8-THC being less potent than delta-9-THC, “it can make you really high,” Gerdeman says. “It’s just a matter of dose. Another issue is, how many of these products have way more delta-9 in them than they say?”

Gerdeman has met both very experienced cannabis users and naive cannabis users who thought delta-8 wouldn’t make them anxious. But it absolutely did when they took too much, he says. “The beauty of cannabis is you don’t get fatal overdoses, but it can make you feel absolutely horrible.”

Tiffany Coleman, director of quality and processing at Carbidex, a cannabis firm in Michigan, experiments with making small-scale batches of delta-8-THC from CBD as a hobby. The state doesn’t allow such activity in commercial cannabis facilities. “I am trying to make sure the science is good,” Coleman says. “I’m working with peers all over the country and looking at different purification methods.”

Product toxicity aside, Coleman worries that people are making delta-8-THC without proper reaction safety controls. The conversion of CBD to delta-8 is an exothermic reaction, so it creates a lot of heat, they say. “This needs to be done in a controlled environment,” such as under dry ice and acetone, they add. Coleman uses glycol chillers to cool down the reaction. An ice bath isn’t cold enough, Coleman warns, saying they know of people who tried that approach and “blew stuff up.”

Coleman also has concerns about some of the solvents people are using. One popular method uses dichloromethane, also known as methylene chloride. Dichloromethane should not be used “without appropriate ventilation and controls because it’s a silent killer,” Coleman says. “A lot of these shops, even the shops in the legal markets, are not ready for this kind of activity.”

Consumers are being used as guinea pigs.
Christopher Hudalla, president and chief scientific officer, ProVerde Laboratories

 

THE CASE FOR REGULATION

Regulators aren’t ready for it, either. Many states are scrambling to control sales of delta-8-THC, which is now the fastest-growing product in the hemp industry. More than a dozen states have banned delta-8-THC and others are developing rules. And it’s not just an issue in the US.

Although the surge of delta-8 products started because of an oversupply of CBD in the US, delta-8-THC is also becoming popular in Europe, Coffin says. The US allows export of CBD isolate, and people in other countries can do whatever they want with it, he says. All the materials needed to make delta-8-THC are easy to get, he adds.

“This problem will not go away,” says Jeffrey Raber, cofounder and CEO of the Werc Shop, a California-based cannabis contract manufacturing and testing firm. “It might actually morph and change into bigger problems” if regulators don’t get a handle on it, he says.

Raber saw delta-8-THC’s market potential in 2018, when Congress legalized hemp in the US. “It’s a very interesting molecule, one that has very different physiological activity depending upon the entourage” and how it is administered, he says.

The Werc Shop published a white paper in 2018 that pointed out the limited availability of high-purity delta-8-THC due to uncontrolled processing steps. Raber is urging regulators to address those purity concerns and deal with delta-8-THC “in a sensible fashion” that enables its use in safe, protected ways. To accomplish that, he says, “make sure it’s tested.”

But existing independent analytical labs can’t handle the burden of exhaustive testing on all delta-8 THC products, according to Amber Wise, scientific director at Medicine Creek Analytics, a cannabis testing firm in Washington State. There are a handful of methods being discussed on online forums that use chemicals “that I would not want to have as residuals” in delta-8-THC products, such as dichloromethane and trichloroacetic acid, Wise says. Her lab hasn’t developed methods to test for those chemicals, she says, adding that it’s not practical to develop methods for every possible reagent people are using to make delta-8-THC. Instead, Wise says, regulators should require manufacturers to reveal what chemicals they use to make delta-8-THC and what compounds are in their final products.

It’s possible that one day there will be cannabis plants that contain sufficient delta-8-THC to extract in pure form. But for now, cannabis plants typically contain 0.1% delta-8-THC or less. “We have seen reports of plants containing as much as 1%,” but those are exceptions, Raber says. To economically extract delta-8-THC from cannabis, the levels need to be about 15–20%. “Genetics folks are going after that now,” he says, but synthetic products will dominate for a while.

Raber also worries that if regulators simply ban delta-8-THC as they did with delta-9-THC, “folks will make delta-10-THC or other types of ring isomers or alkyl chain analogs” such as tetrahydrocannabivarin. Some of these analogs could be toxic or “wildly psychoactive,” Raber says. The regulatory language needs to be broad, or “you’ll be stuck in this multiyear cycle of legislative fix.” This is in contrast to the 2018 Farm Bill, which limited the amount of delta-9-THC in hemp and hemp-derived products, such as CBD.

Gerdeman is particularly concerned about another cannabinoid called THC-O-acetate, the acetate ester of THC, which he’s seeing popping up in gummies and vapes. It is basically acetylated THC, which does not occur naturally in cannabis plants, he says. Heroin was created by acetylating morphine over 100 years ago, resulting in a drug that is much more potent than morphine because of pharmacokinetics, Gerdeman points out. “Do we have human studies on the effects of acetylated THC? No, not at all,” he says. And, as is the case with delta-8-THC, there’s no information on what else is in those products.

Without better regulation, consumers will continue to be duped by unscrupulous producers, according to Hudalla. For delta-8-THC, he says, “we need to get the truth out to the public” that it is a synthetic compound made from an ingredient extracted from hemp. “Like making methamphetamine from cold medicine, just because the starting materials are legal, does not make the resulting product legal (or safe),” Hudalla warns. He, like many chemists, believes delta-8-THC is a synthetic cannabinoid that is not legal.

“Many participants in the hemp industry see delta-8-THC as the salvation, providing a financial bridge until the [US Food and Drug Administration] approves CBD as a dietary ingredient,” Hudalla says. “But I do not believe that it should be at the expense of unsuspecting consumers, who are being misled about what products they are being sold, to bail out the producers and investors who gambled on the CBD market,” he says.

“I believe that delta-8 has a legitimate place in therapeutics and potentially adult use,” Hudalla adds. “But I just don’t see anybody doing it appropriately. It’s all bathtub gin.”


MOST POPULAR IN BIOLOGICAL CHEMISTRY


A PREVENTATIVE INCIDENT
Accidental mix of bleach and acid kills Buffalo Wild Wings employee
Incidents like this, which create chlorine gas, occur more than 2,000 times per year in the US

by Leigh Krietsch Boerner
November 13, 2019 | A version of this story appeared in Volume 97, Issue 45


Credit: Shutterstock

FAST FACTS ABOUT WORKING WITH CLEANERS


▸ Check labels on cleaners before using them to learn about risks.

▸ Keep cleaners locked up and away from children and pets.

▸ Don’t mix cleaners.

▸ Never mix bleach with anything (it can have toxic reactions with many other substances).

▸ Make sure to use cleaners in a well-ventilated area.

▸ If an accidental mixture occurs, don’t try to clean it up or neutralize it. Get out of the area and call 911.


You should never mix bleach with anything, but that’s what happened during an accident at a Buffalo Wild Wings in Burlington, Massachusetts, on the evening of Nov. 7. According to Burlington Fire Department assistant chief Michael Patterson, an employee spilled the cleaner Scale Kleen on the floor. Later, another employee started to clean the floor with another cleaner called Super 8. The mixture turned green and started bubbling. The bubbling puddle emitted fumes, driving employees and customers to evacuate the restaurant. The manager, 32-year-old Ryan Baldera, attempted to clean up the liquid and was overcome by the fumes. He died later at the hospital, states a Burlington Fire Department press release.


According to safety data sheets, Super 8 is a mixture of 8–10% sodium hypochlorite in water, stronger than household bleach. Scale Kleen contains 22–28% phosphoric acid, 18–23% nitric acid, and less than 1% urea. Generally, strong cleaners like these are used in businesses, but some may be available to the public. Mixing bleach and acid gives off chlorine gas, says Neal Langerman, CEO and principal scientist at Advanced Chemical Safety. The reaction is “well-known, simple, instantaneous,” he says. “The green bubbles give it away.”


Chlorine gas is a chemical warfare agent introduced during World War I and is still used in conflicts in the Middle East, Langerman says. When chlorine gas hits a person’s lungs, it generates a noxious mixture of hydrochloric acid, hypochlorous acid, hypochlorite, and other corrosive compounds. “Dissolve” is a pretty apt description of what the mixture does to tissue, he says. The cause of death tends to be chemical pneumonia. “The victim’s lungs cease being able to move gases and fill with liquid,” Langerman adds. “The medical staff would just see their patient going south with their lungs filling with liquid that they can’t keep empty. At some point, a pressure respirator just can’t compete with damage that’s done.”


Mixing bleach with other substances can also create harmful situations. Adding ammonia to bleach creates chloramine, another toxic gas. Bleach plus hydrogen peroxide creates oxygen gas so violently, it can cause an explosion. “One should not mix household cleaners as a general rule,” Langerman says. “You do not necessarily make a strong cleaner by mixing two cleaners together.”


Because the incident at Buffalo Wild Wings is an ongoing investigation, officials are not releasing Baldera’s cause of death, says a Burlington Fire Department spokesperson. According to the American Association of Poison Control Centers, accidental exposures to chlorine gas from mixing bleach and acid happened 2,284 times in 2017, the most recent year for which the agency has data. In the US, the Federal Hazardous Substances Act requires that cleaning products be labeled with the hazard and what first-aid steps to take if there’s an accident. Most US states, including Massachusetts, where the accident occurred, require that managers of restaurants get certification through ServSafe, a training and testing program from the National Restaurant Association. Part of this training is the appropriate handling of chemicals.


Event Horizon Telescope captures ‘beautiful’ images of second black hole’s jet

The massive jets of material shooting out of Centaurus A’s center are powered by a matter-guzzling black hole.

 
NASA/CXC/SAO; ROLF OLSEN; NASA/JPL-CALTECH; NRAO/AUI/NSF/UNIVERSITY OF HERTFORDSHIRE/M. HARDCASTLE

The astronomy team that 2 years ago captured the first close-up of a giant black hole, lurking at the center of the galaxy Messier 87 (M87), has now zoomed in on a second, somewhat smaller giant in the nearby active galaxy Centaurus A. The Event Horizon Telescope’s (EHT’s) latest image should help resolve questions about how such galactic centers funnel huge amounts of matter into powerful beams and fire them thousands of light-years into space. Together the images also support theorists’ belief that all black holes operate the same way, despite huge variations in their masses.

“This is really nice,” astronomer Philip Best of the University of Edinburgh says of the new EHT image. “The angular resolution is astonishing compared to previous images of these jets.”

The EHT merges dozens of widely dispersed radio dishes, from Hawaii to France and from Greenland to the South Pole, into a huge virtual telescope. By pointing a large number of dishes at a celestial object at the same time and carefully time stamping the data from each one with an atomic clock, researchers can later reassemble it with massive computing clusters—a process that takes years—to produce an image with a resolution as sharp as that of a single Earth-size dish. One challenge is getting observing time on 11 different observatories simultaneously, so the EHT only operates for a few weeks each year; poor weather and technical glitches often further narrow that window.

The virtual telescope probed Centaurus A during the same 2017 observing campaign that produced the now-famous image of the supermassive black hole in M87Science’s Breakthrough of the Year for 2019. Centaurus A, about 13 million light-years away, is one of the closest galaxies to Earth that is bright at radio wavelengths. It also has obvious jets spewing matter above and below the galactic disk, a hallmark of an active giant black hole. “We wanted to see what the jet looked like at the resolution” EHT could offer, says team member Michael Janssen of the Max Planck Institute for Radio Astronomy. “We didn’t know what to expect.”

The Event Horizon Telescope has produced detailed images of the beams of matter from Centaurus A’s center, revealing the jets have a dark center paralleled by glowing edges.

 
M. JANSSEN, NATURE ASTRONOMY (2021) 10.1038

The result, which he and colleagues report today in Nature Astronomy, was a detailed image of how the jet emerges from the region around Centaurus A’s supermassive black hole, showing a remarkable similarity to EHT’s images of M87’s jet on a much smaller scale. Images of Centaurus A’s jets taken by other telescopes at different wavelengths revealed little detail, but the EHT images show the jet with a dark center flanked by two bright stripes; Best suggests the jet may appear bright around its edge because its outer regions rub against surrounding gas and dust, causing them to glow.

Astrophysicists don’t fully understand how galactic nuclei drive these fantastically powerful fountains. One theory holds that an accretion disk, the swirling whirlpool of matter spiraling into the black hole, generates a magnetic field that funnels some of the matter into a jet. Others argue this magnetic field must tap into the rotational energy of the black hole itself to be able to achieve such colossal power.

The new observations of Centaurus A don’t resolve that question, but they hold clues. Janssen says the images show that the remarkably parallel edges of the jet narrow into a cone close to the black hole. The base of that cone remains wide, he says, which might suggest it is coming from the accretion disk. “It remains to be seen,” he says.

Theoretical astrophysicist Jim Beall of St. John’s College says there may be no single answer: The spin of the black hole drags on the innermost stable orbit of the infalling matter, which in turn affects how the accretion disk shapes and powers the jet. “It’s a symbiotic relationship,” he says. “The EHT takes us down close to the accretion disk. The results are really quite beautiful.”

The pictures of Centaurus A also fill in a size gap in black hole observations. Observers have studied the workings of jets coming from the very largest of black holes—including M87—weighing billions of times the mass of our Sun. They’ve also seen jets from much smaller black holes, with masses of a few tens of Suns. The new view of Centaurus A, at 55 million times the Sun’s mass, looks just like its bigger and smaller relatives. This confirms the idea that black holes are essentially simple objects, defined only by their mass, charge, and spin, so those with the mass of a large star should behave no differently from one with the mass of a galaxy.

Our universe might be a giant three-dimensional donut, really.

THAT MAKES GOD A COP 😄😄😄


By Paul Sutter - Astrophysicist 
(Image credit: wacomka/iStock/Getty Images Plus)

Imagine a universe where you could point a spaceship in one direction and eventually return to where you started. If our universe were a finite donut, then such movements would be possible and physicists could potentially measure its size.

"We could say: Now we know the size of the universe," astrophysicist Thomas Buchert, of the University of Lyon, Astrophysical Research Center in France, told Live Science in an email.

Examining light from the very early universe, Buchert and a team of astrophysicists have deduced that our cosmos may be multiply connected, meaning that space is closed in on itself in all three dimensions like a three-dimensional donut. Such a universe would be finite, and according to their results, our entire cosmos might only be about three to four times larger than the limits of the observable universe, about 45 billion light-years away.

Physicists use the language of Einstein's general relativity to explain the universe. That language connects the contents of spacetime to the bending and warping of spacetime, which then tells those contents how to interact. This is how we experience the force of gravity. In a cosmological context, that language connects the contents of the entire universe — dark matter, dark energy, regular matter, radiation and all the rest — to its overall geometric shape. For decades, astronomers had debated the nature of that shape: whether our universe is "flat" (meaning that imaginary parallel lines would stay parallel forever), "closed" (parallel lines would eventually intersect) or "open" (those lines would diverge).

That geometry of the universe dictates its fate. Flat and open universes would continue to expand forever, while a closed universe would eventually collapse in on itself.

Multiple observations, especially from the cosmic microwave background (the flash of light released when our universe was only 380,000 years old), have firmly established that we live in a flat universe. Parallel lines stay parallel and our universe will just keep on expanding.

But there's more to shape than geometry. There's also topology, which is how shapes can change while maintaining the same geometric rules.

For example, take a flat piece of paper. It's obviously flat — parallel lines stay parallel. Now, take two edges of that paper and roll it up into a cylinder. Those parallel lines are still parallel: Cylinders are geometrically flat. Now, take the opposite ends of the cylindrical paper and connect those. That makes the shape of a donut, which is also geometrically flat.

While our measurements of the contents and shape of the universe tell us its geometry — it's flat — they don't tell us about the topology. They don't tell us if our universe is multiply-connected, which means that one or more of the dimensions of our cosmos connect back with each other.

Look to the light


While a perfectly flat universe would extend out to infinity, a flat universe with a multiply-connected topology would have finite size. If we could somehow determine whether one or more dimensions are wrapped in on themselves, then we would know that the universe is finite in that dimension. We could then use those observations to measure the total volume of the universe.

But how would a multiply-connected universe reveal itself?


A team of astrophysicists from Ulm University in Germany and the University of Lyon in France looked to the cosmic microwave background (CMB). When the CMB was released, our universe was a million times smaller than it is today, and so if our universe is indeed multiply connected, then it was much more likely to wrap in on itself within the observable limits of the cosmos back then. Today, due to the expansion of the universe, it's much more likely that the wrapping occurs at a scale beyond the observable limits, and so the wrapping would be much harder to detect. Observations of the CMB give us our best chance to see the imprints of a multiply connected universe.

The team specifically looked at the perturbations — the fancy physics term for bumps and wiggles — in the temperature of the CMB. If one or more dimensions in our universe were to connect back with themselves, the perturbations couldn't be larger than the distance around those loops. They simply wouldn't fit.

As Buchert explained to Live Science in an email, "In an infinite space, the perturbations in the temperature of the CMB radiation exist on all scales. If, however, space is finite, then there are those wavelengths missing that are larger than the size of the space."

In other words: There would be a maximum size to the perturbations, which could reveal the topology of the universe.

Making the connection



Maps of the CMB made with satellites like NASA's WMAP and and the ESA's Planck have already seen an intriguing amount of missing perturbations at large scales. Buchert and his collaborators examined whether those missing perturbations could be due to a multiply-connected universe. To do that, the team performed many computer simulations of what the CMB would look like if the universe were a three-torus, which is the mathematical name for a giant three-dimensional donut, where our cosmos is connected to itself in all three dimensions.

"We therefore have to do simulations in a given topology and compare with what is observed," explained Buchert. "The properties of the observed fluctuations of the CMB then show a 'missing power' on scales beyond the size of the universe." A missing power means that the fluctuations in the CMB are not present at those scales. That would imply that our universe is multiply-connected, and finite, at that size scale.

"We find a much better match to the observed fluctuations, compared with the standard cosmological model which is thought to be infinite," he added.

"We can vary the size of the space and repeat this analysis. The outcome is an optimal size of the universe that best matches the CMB observations. The answer of our paper is clearly that the finite universe matches the observations better than the infinite model. We could say: Now we know the size of the universe."

The team found that a multiply-connected universe about three to four times larger than our observable bubble best matched the CMB data. While this result technically means that you could travel in one direction and end up back where you started, you wouldn't be able to actually accomplish that in reality. We live in an expanding universe, and at large scales the universe is expanding at a rate that is faster than the speed of light, so you could never catch up and complete the loop.

Buchert emphasized that the results are still preliminary. Instrument effects could also explain the missing fluctuations on large scales.

Still, it's fun to imagine living on the surface of a giant donut.

Originally published on Live Science.


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Paul Sutter is a research professor in astrophysics at the Institute for Advanced Computational Science at Stony Brook University and the Flatiron Institute in New York City. He is also the host of several shows, such as "How the Universe Works" on Science Channel, "Space Out" on Discovery, and his hit "Ask a Spaceman" podcast. He is the author of two books, "Your Place in the Universe" and "How to Die in Space," as well as a regular contributor to Space.com, LiveScience, and more. Paul received his PhD in Physics from the University of Illinois at Urbana-Champaign in 2011, and spent three years at the Paris Institute of Astrophysics, followed by a research fellowship in Trieste, Italy,
NASA's Hubble Space Telescope photographed colliding galaxies after recovering from a month-long mystery glitch

Morgan McFall-Johnsen
Mon., July 19, 2021, 

NASA's Hubble Space Telescope photographed colliding galaxies after recovering from a month-long mystery glitch


The Hubble Space Telescope hovers at the boundary of Earth and space in this picture, taken after Hubble's second servicing mission in 1997. NASA

NASA shared the Hubble Space Telescope's first photos since it was fixed this weekend.

Hubble is back online after a month of mysterious glitching that forced NASA to use backup hardware.

The photos show colliding galaxies and a long galactic spiral.

The Hubble Space Telescope is back, and NASA has the pictures to prove it.


The Earth-orbiting observatory went offline on June 13 and stayed that way for more than a month while engineers struggled to identify a mysterious glitch. NASA still hasn't announced what exactly caused the problem, but the agency's engineers managed to bring Hubble back online by activating some of its backup hardware on Thursday.

"I was quite worried," NASA Associate Administrator Thomas Zurbuchen said in a Friday video interview with Nzinga Tull, who led the Hubble team through troubleshooting. "We all knew this was riskier than we normally do."

Hubble slowly powered up its science instruments again over the weekend and conducted system check-outs to make sure everything still worked. Then it snapped its first images since the whole debacle started.

The telescope focused its lens on a set of unusual galaxies on Saturday. One of its new images shows a pair of galaxies slowly colliding. The other image shows a spiral galaxy with long, extended arms. Most spiral galaxies have an even number of arms, but this one only has three.

Hubble's first images after recovering from a month-long glitch show some unusual galaxies. Science: NASA, ESA, STScI, Julianne Dalcanton (UW) Image processing: Alyssa Pagan (STScI)

Hubble is also observing Jupiter's northern and southern lights, or auroras, as well as tight clusters of stars. NASA hasn't shared images from those observations yet.

"I'm thrilled to see that Hubble has its eye back on the universe, once again capturing the kind of images that have intrigued and inspired us for decades," NASA Administrator Bill Nelson said in a press release. "This is a moment to celebrate the success of a team truly dedicated to the mission. Through their efforts, Hubble will continue its 32nd year of discovery, and we will continue to learn from the observatory's transformational vision."


A mysterious glitch that took a month to fix



The Hubble Space Telescope in orbit above Earth. NASA


Hubble, the world's most powerful space telescope, launched into orbit in 1990. It has photographed the births and deaths of stars, spotted new moons circling Pluto, and tracked two interstellar objects zipping through our solar system. Its observations have allowed astronomers to calculate the age and expansion of the universe and to peer at galaxies formed shortly after the Big Bang.

But the telescope's payload computer suddenly stopped working on June 13. That computer, built in the 1980s, is like Hubble's brain - it controls and monitors all the science instruments on the spacecraft. Engineers tried and failed to bring it back online several times. Eventually, after running more diagnostic tests, they realized that the computer wasn't the problem at all - some other hardware on the spacecraft was causing the shutdown


Nzinga Tull, Hubble systems anomaly response manager at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, works in the control room July 15 to restore Hubble to full science operations. NASA GSFC/Rebecca Roth

It's still not totally clear which piece of hardware was the culprit. Engineers suspect that a failsafe on the telescope's Power Control Unit (PCU) instructed the payload computer to shut down. The PCU could have been sending the wrong voltage of electricity to the computer, or the failsafe itself could have been malfunctioning.

NASA was prepared for issues like this. Each piece of Hubble's hardware has a twin pre-installed on the telescope in case it fails. So engineers switched all the faulty parts to that backup hardware. Now the telescope is back in full observation mode.

"I feel super excited and relieved," Tull said after making the hardware switch. "Glad to have good news to share."

Though NASA has fixed the glitch, it's a sign that Hubble's age may be starting to interfere with its science. The telescope hasn't been upgraded since 2009, and some of its hardware is more than 30 years old.

"This is an older machine, and it's kind of telling us: Look, I'm getting a little bit old here, right? It's talking to us," Zurbuchen said on Friday. "Despite that, more science is ahead, and we're excited about it."

Cosmic Lens Flare: Hubble Captures Strong Gravitational Lensing


Galaxy cluster MACSJ0138.0-2155 imaged by the Hubble Space Telescope. Credit: ESA/Hubble & NASA, A. Newman, M. Akhshik, K. Whitaker

The center of this image from the NASA/ESA Hubble Space Telescope is framed by the tell-tale arcs that result from strong gravitational lensing, a striking astronomical phenomenon which can warp, magnify, or even duplicate the appearance of distant galaxies. 

Gravitational lensing occurs when light from a distant galaxy is subtly distorted by the gravitational pull of an intervening astronomical object. In this case, the relatively nearby galaxy cluster MACSJ0138.0-2155 has lensed a significantly more distant quiescent galaxy — a slumbering giant known as MRG-M0138 which has run out of the gas required to form new stars and is located 10 billion light years away. Astronomers can use gravitational lensing as a natural magnifying glass, allowing them to inspect objects like distant quiescent galaxies which would usually be too difficult for even Hubble to resolve.

This image was made using observations from eight different infrared filters spread across two of Hubble’s most advanced astronomical instruments: the Advanced Camera for Surveys and the Wide Field Camera 3. These instruments were installed by astronauts during the final two servicing missions to Hubble, and provide astronomers with superbly detailed observations across a large area of sky and a wide range of wavelengths.