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Tonight offers us a treat. The bright planet Venus hangs in the western sky. Underneath Venus you’ll see the thin waxing crescent moon. The two are a spectacle. It gets better.
Tomorrow night, the moon and Venus are even more impressive as they appear really close together, almost two degrees apart. They are in the zodiacal constellation Capricornus. Take a look.
The show is over by Sunday night, when the moon is a good deal higher in the southwestern sky and has moved farther along the zodiac.
Many miles are tied into this show. Venus is 120 million miles away, while the moon is only roughly a quarter of a million miles away. Both are lit by the sun, which is about 93 million miles away.
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This hot super-Earth has temperatures of 800°F and rivers of glowing lava – Digital Trends
No day or night, heat intense enough to melt lead, and glowing rivers of lava: This hellish landscape is a typical day on Gliese 486b, a recently discovered exoplanet orbiting the nearby star Gliese 486. The planet is rocky and around three times the mass of Earth, making it a type called a super-Earth. But it is so hot that the conditions there are quite different from what we’re used to.
The planet is so close to its star that a year there lasts only 1.5 Earth days. Though the star is fainter and cooler than our sun, the planet orbits just 1.5 million miles away and it is tidally locked, meaning one side of the planet always faces the star. This drives temperatures up even higher, reaching a surface temperature of 700 Kelvin (800 degrees Fahrenheit).
The researchers who made the discovery believe this means the planet would appear more like Venus than like Earth, with a hot and dry landscape and rivers of glowing lava. There is probably little atmosphere there, as the heat from the star would act to evaporate it away, but the planet’s gravity likely helps it to retain some atmosphere.
The potential existence of a thin but present atmosphere makes this planet an excellent candidate for research as it allows scientists to test their theories on atmospheric models for rocky planets. “The discovery of Gliese 486b was a stroke of luck,” said José A. Caballero of the Centro de Astrobiología in Spain, co-author of the paper, in a statement. “A hundred degrees hotter and the planet’s entire surface would be lava. Its atmosphere would consist of vaporized rocks. On the other hand, if Gliese 486b were a hundred degrees colder, it would have been unsuitable for follow-up observations.”
The researchers now want to use upcoming next-generation telescopes to study the planet further and to try to peer into its atmosphere to see its composition. “The proximity of this exoplanet is exciting because it will be possible to study it in more detail with powerful telescopes such as the upcoming James Webb Space Telescope and the future Extremely Large Telescopes,” said lead author Trifon Trifonov of the Max Planck Institute for Astronomy.
“We can hardly wait for the new telescopes to become available. The results will help us to understand how well rocky planets can hold their atmospheres, what they are made of, and how they influence the energy distribution on the planets.”
In Oregon, Scientists Find a Virus Variant With a Worrying Mutation – Yahoo News
Scientists in Oregon have spotted a homegrown version of a fast-spreading variant of the coronavirus that first surfaced in Britain — but now it’s combined with a mutation that may make the variant less susceptible to vaccines.
The researchers have so far found just a single case of this formidable combination, but genetic analysis suggested that the variant had been acquired in the community and did not arise in the patient.
“We didn’t import this from elsewhere in the world — it occurred spontaneously,” said Brian O’Roak, a geneticist at Oregon Health and Science University who led the work. He and his colleagues participate in the Centers for Disease Control and Prevention’s effort to track variants, and they have deposited their results in databases shared by scientists.
The variant originally identified in Britain, called B.1.1.7, has been spreading rapidly across the United States, and accounts for at least 2,500 cases in 46 states. This form of the virus is both more contagious and more deadly than the original version, and it is expected to account for most U.S. infections in a few weeks.
The new version that surfaced in Oregon has the same backbone, but also a mutation — E484K, or “Eek” — seen in variants of the virus circulating in South Africa, Brazil and New York City.
Lab studies and clinical trials in South Africa indicate that the Eek mutation renders the current vaccines less effective by blunting the body’s immune response. (The vaccines still work, but the findings are worrying enough that Pfizer-BioNTech and Moderna have begun testing new versions of their vaccines designed to defeat the variant found in South Africa.)
The B.1.1.7 variant with Eek also has emerged in Britain, designated as a “variant of concern” by scientists. But the virus identified in Oregon seems to have evolved independently, O’Roak said.
O’Roak and his colleagues found the variant among coronavirus samples collected by the Oregon State Public Health Lab across the state, including some from an outbreak in a health care setting. Of the 13 test results they analyzed, 10 turned out to be B.1.1.7 alone, and one the combination.
Other experts said the discovery was not surprising, because the Eek mutation has arisen in forms of the virus all over the world. But the mutation’s occurrence in B.1.1.7 is worth watching, they said.
In Britain, this version of the variant accounts for a small number of cases. But by the time the combination evolved there, B.1.1.7 had already spread through the country.
“We’re at the point where B.1.1.7 is just being introduced” into the United States, said Stacia Wyman, an expert in computational genomics at the University of California, Berkeley. “As it evolves, and as it slowly becomes the dominant thing, it could accumulate more mutations.”
Viral mutations may enhance or weaken one another. For example, the variants identified in South Africa and Brazil contain many of the same mutations, including Eek. But the Brazilian version has a mutation, K417N, that is not present in the version from South Africa.
In a study published Thursday in Nature, researchers compared antibody responses to all three variants of concern — the ones identified in Britain, South Africa and Brazil. Consistent with other studies, they found that the variant that pummeled South Africa is most resistant to antibodies produced by the immune system.
But the variant circulating in Brazil was not as resistant, even though it carried the Eek mutation. “If you have the second mutation, you don’t see as bad an effect,” said Michael Diamond, a viral immunologist at Washington University in St. Louis, who led the study.
It’s too early to say whether the variant in Oregon will behave like the ones in South Africa or Brazil. But the idea that other mutations could weaken Eek’s effect is “excellent news,” Wyman said.
Overall, she said, the Oregon finding reinforces the need for people to continue to take precautions, including wearing a mask, until a substantial portion of the population is immunized.
“People need to not freak out but to continue to be vigilant,” she said. “We can’t let down our guard yet while there’s still these more transmissible variants circulating.”
This article originally appeared in The New York Times.
© 2021 The New York Times Company
NASA rover Perseverance takes first spin on surface of Mars – Global News
NASA’s Mars rover Perseverance has taken its first, short drive on the surface of the red planet, two weeks after the robot science lab’s picture-perfect touchdown on the floor of a massive crater, mission managers said on Friday.
The six-wheeled, car-sized astrobiology probe put a total of 6.5 meters (21.3 feet) on its odometer on Thursday during a half-hour test spin within Jezero Crater, site of an ancient, long-vanished lake bed and river delta on Mars.
Taking directions from mission managers at NASA’s Jet Propulsion Laboratory (JPL) near Los Angeles, the rover rolled 4 meters (13.1 feet) forward, turned about 150 degrees to its left and then drove backward another 2.5 meters (8.2 feet).
“It went incredibly well,” Anais Zarifian, a JPL mobility test engineer for Perseverance, said during a teleconference briefing with reporters, calling it a “huge milestone” for the mission.
NASA displayed a photo taken by the rover showing the wheel tread marks left in the reddish, sandy Martian soil after its first drive.
Perseverance rover: Scientist on when we can expect samples back from Mars
Another vivid image of the surrounding landscape shows a rugged, ruddy terrain littered with large, dark boulders in the foreground and a tall outcropping of rocky, layered deposits in the distance – marking the edge of the river delta.
Some additional, short-distance test driving is planned for Friday. Perseverance is capable of averaging 200 meters of driving per day.
But JPL engineers still have additional equipment checks to run on the rover‘s many instruments before they will be ready to send the robot on a more ambitious journey as part of its primary mission to search for traces of fossilized microbial life.
So far, Perseverance and its hardware, including its main robot arm, appear to be operating flawlessly, said Robert Hogg, deputy mission manager. The team has yet to conduct post-landing tests of the rover‘s sophisticated system to drill and collect rock samples for return to Earth via future Mars missions.
NASA announced it has named the site of Perseverance’s Feb. 18 touchdown as the “Octavia E. Butler Landing,” in honor of the award-winning American science-fiction writer. Butler, a native of Pasadena, California, died in 2006 at age 58.
(Reporting by Steve Gorman, Editing by Rosalba O’Brien)
© 2021 Reuters
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