Astronomers have used a combination of telescopes to reveal a system consisting of six exoplanets, five of which are locked in a rare rhythm around their central star. “The researchers believe the system could provide important clues about how planets, including those in the Solar System, form and evolve,” reports Phys.Org. From the report: The first time the team observed TOI-178, a star some 200 light-years away in the constellation of Sculptor, they thought they had spotted two planets going around it in the same orbit. However, a closer look revealed something entirely different. “Through further observations we realised that there were not two planets orbiting the star at roughly the same distance from it, but rather multiple planets in a very special configuration,” says Adrien Leleu from the Universite de Geneve and the University of Bern, Switzerland, who led a new study of the system published in Astronomy & Astrophysics. The new research has revealed that the system boasts six exoplanets and that all but the one closest to the star are locked in a rhythmic dance as they move in their orbits. In other words, they are in resonance. This means that there are patterns that repeat themselves as the planets go around the star, with some planets aligning every few orbits. A similar resonance is observed in the orbits of three of Jupiter’s moons: Io, Europa and Ganymede. Io, the closest of the three to Jupiter, completes four full orbits around Jupiter for every orbit that Ganymede, the furthest away, makes, and two full orbits for every orbit Europa makes.

The five outer exoplanets of the TOI-178 system follow a much more complex chain of resonance, one of the longest yet discovered in a system of planets. While the three Jupiter moons are in a 4:2:1 resonance, the five outer planets in the TOI-178 system follow a 18:9:6:4:3 chain: while the second planet from the star (the first in the resonance chain) completes 18 orbits, the third planet from the star (second in the chain) completes 9 orbits, and so on. In fact, the scientists initially only found five planets in the system, but by following this resonant rhythm they calculated where in its orbit an additional planet would be when they next had a window to observe the system.

More than just an orbital curiosity, this dance of resonant planets provides clues about the system’s past. “The orbits in this system are very well ordered, which tells us that this system has evolved quite gently since its birth,” explains co-author Yann Alibert from the University of Bern. If the system had been significantly disturbed earlier in its life, for example by a giant impact, this fragile configuration of orbits would not have survived.

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Source: Slashdot – Puzzling Six-Exoplanet System With Rhythmic Movement Challenges Theories of How Planets Form

An anonymous reader quotes a report from NPR: New coronavirus variants seem to be cropping up everywhere. There’s one from the U.K., which is more contagious and already circulating in the United States. There’s one from South Africa, which is forcing Moderna and Pfizer to reformulate their COVID-19 vaccines and create “booster” shots, just to make sure the vaccines maintain their efficacies. But for some scientists, the most worrying variant might be the newest one. A variant called P.1, which emerged in early December in Manaus, Brazil, and by mid-January had already caused a massive resurgence in cases across the city of 2 million people. […] The concern with P.1 is twofold: scientists don’t understand why the variant has spread so explosively in Brazil, and the variant carries a particularly dangerous set of mutations.

While the variant from the U.K. took about three months to dominate the outbreak in England, P.1 took only about a month to dominate the outbreak in Manaus. In addition, Manaus had already been hit extremely hard by the virus back in April. One study estimated that the population should have reached herd immunity and the virus shouldn’t be able to spread easily in the community. So why would the city see an even bigger surge 10 months later? Could P.1 be evading the antibodies made against the previous version of the virus, making reinfections easier? Could it just be significantly more contagious? Could both be true? “While we don’t *know* exactly why this variant has been so apparently successful in Brazil, none of the explanations on the table are good,” epidemiologist Bill Hanage, at Harvard University, wrote on Twitter.

Reinfections are a serious concern for several reasons. First off, like the variant from South Africa, P.1 carries a cluster of mutations along the surface of the virus where antibodies — especially the potent antibodies — like to bind. “They are kind of the major targets of the immune system,” says virologist Penny Moore at the National Institute for Communicable Diseases in South Africa and the University of KwaZulu-Natal. “So when we see a whole lot of mutations in [those surfaces], it raises the possibility that the mutations might be conferring immune escape.” That is, the mutations are helping the virus evade antibodies or escape recognition by them. In essence, the mutations are providing the virus with a type of invisibility cloak. And thus, now we have a game of “cat and mouse,” says virologist Ravi Gupta, between the virus and the vaccine. The virus finds ways around the vaccine (and our immune system), says Gupta, and so the manufacturers have to reformulate the vaccines (or else we run the risk of getting infected twice).

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Source: Slashdot – Why Scientists Are Very Worried About the Variant From Brazil

International law enforcement agencies said on Wednesday they had dismantled a criminal hacking scheme used to steal billions of dollars from businesses and private citizens worldwide. Reuters reports: Police in six European countries, as well as Canada and the United States, completed a joint operation to take control of Internet servers used to run and control a malware network known as “Emotet,” authorities said in a statement. “Emotet is currently seen as the most dangerous malware globally,” Germany’s BKA federal police agency said in a statement. “The smashing of the Emotet infrastructure is a significant blow against international organized Internet crime.”

German police said infections with Emotet had caused at least 14.5 million euros ($17.56 million) of damage in their country. Globally, Emotet-linked damages cost about $2.5 billion, Ukrainian authorities said. Ukraine’s General Prosecutor said police had carried out raids in the eastern city of Kharkiv to seize computers used by the hackers. Authorities released photos showing piles of bank cards, cash and a room festooned with tangled computer equipment, but did not say if any arrests were made.

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Source: Slashdot – Police Dismantle World’s ‘Most Dangerous’ Criminal Hacking Network

An anonymous reader writes: AT&T lost 617,000 customers from DirecTV and its other TV businesses in the final quarter of 2020, capping a year in which it lost nearly 3 million customers in the category, AT&T reported today. AT&T today also informed the Securities and Exchange Commission that it has taken “noncash impairment charges of $15.5 billion” related to its ongoing DirecTV debacle. AT&T said the $15.5 billion charges reflect “changes in our management strategy and our evaluation of the domestic video business… including our decision to operate our video business separately from our broadband and legacy telephony operations.” This operational decision “required us to identify a separate Video reporting unit and to assess both the recoverability of its long-lived assets and any assigned goodwill for impairment,” AT&T said.

AT&T said it also logged “charges of approximately $780 million from the impairment of production and other content inventory at WarnerMedia, with $520 million resulting from the continued shutdown of theaters during the pandemic and the hybrid distribution model for our 2021 film slate.” The charges were added to AT&T’s Q4 expenses. As a result, AT&T reported a $13.9 billion net loss in the quarter, compared to a net profit of $2.4 billion a year ago. Q4 revenue was $45.7 billion, down from $46.8 billion year over year. The Q4 net loss swung AT&T to a full-year net loss of $5.4 billion.

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Source: Slashdot – AT&T Eats a .5 Billion Impairment Charge As DirecTV Debacle Continues