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Possible marker of life spotted on Venus

#1
C C Offline
https://www.eso.org/public/news/eso2015/

RELEASE: An international team of astronomers today announced the discovery of a rare molecule — phosphine — in the clouds of Venus. On Earth, this gas is only made industrially or by microbes that thrive in oxygen-free environments. Astronomers have speculated for decades that high clouds on Venus could offer a home for microbes — floating free of the scorching surface but needing to tolerate very high acidity. The detection of phosphine could point to such extra-terrestrial “aerial” life.

“When we got the first hints of phosphine in Venus’s spectrum, it was a shock!”, says team leader Jane Greaves of Cardiff University in the UK, who first spotted signs of phosphine in observations from the James Clerk Maxwell Telescope (JCMT), operated by the East Asian Observatory, in Hawaiʻi. Confirming their discovery required using 45 antennas of the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile, a more sensitive telescope in which the European Southern Observatory (ESO) is a partner. Both facilities observed Venus at a wavelength of about 1 millimetre, much longer than the human eye can see — only telescopes at high altitude can detect it effectively.

The international team, which includes researchers from the UK, US and Japan, estimates that phosphine exists in Venus’s clouds at a small concentration, only about twenty molecules in every billion. Following their observations, they ran calculations to see whether these amounts could come from natural non-biological processes on the planet. Some ideas included sunlight, minerals blown upwards from the surface, volcanoes, or lightning, but none of these could make anywhere near enough of it. These non-biological sources were found to make at most one ten thousandth of the amount of phosphine that the telescopes saw.

To create the observed quantity of phosphine (which consists of hydrogen and phosphorus) on Venus, terrestrial organisms would only need to work at about 10% of their maximum productivity, according to the team. Earth bacteria are known to make phosphine: they take up phosphate from minerals or biological material, add hydrogen, and ultimately expel phosphine. Any organisms on Venus will probably be very different to their Earth cousins, but they too could be the source of phosphine in the atmosphere.

While the discovery of phosphine in Venus’s clouds came as a surprise, the researchers are confident in their detection. “To our great relief, the conditions were good at ALMA for follow-up observations while Venus was at a suitable angle to Earth. Processing the data was tricky, though, as ALMA isn’t usually looking for very subtle effects in very bright objects like Venus,” says team member Anita Richards of the UK ALMA Regional Centre and the University of Manchester. “In the end, we found that both observatories had seen the same thing — faint absorption at the right wavelength to be phosphine gas, where the molecules are backlit by the warmer clouds below,” adds Greaves, who led the study published today in Nature Astronomy.

Another team member, Clara Sousa Silva of the Massachusetts Institute of Technology in the US, has investigated phosphine as a “biosignature” gas of non-oxygen-using life on planets around other stars, because normal chemistry makes so little of it. She comments: “Finding phosphine on Venus was an unexpected bonus! The discovery raises many questions, such as how any organisms could survive. On Earth, some microbes can cope with up to about 5% of acid in their environment — but the clouds of Venus are almost entirely made of acid.”

The team believes their discovery is significant because they can rule out many alternative ways to make phosphine, but they acknowledge that confirming the presence of “life” needs a lot more work. Although the high clouds of Venus have temperatures up to a pleasant 30 degrees Celsius, they are incredibly acidic — around 90% sulphuric acid — posing major issues for any microbes trying to survive there.

ESO astronomer and ALMA European Operations Manager Leonardo Testi, who did not participate in the new study, says: “The non-biological production of phosphine on Venus is excluded by our current understanding of phosphine chemistry in rocky planets' atmospheres. Confirming the existence of life on Venus's atmosphere would be a major breakthrough for astrobiology; thus, it is essential to follow-up on this exciting result with theoretical and observational studies to exclude the possibility that phosphine on rocky planets may also have a chemical origin different than on Earth.”

More observations of Venus and of rocky planets outside our Solar System, including with ESO’s forthcoming Extremely Large Telescope, may help gather clues on how phosphine can originate on them and contribute to the search for signs of life beyond Earth. This research was presented in the paper “Phosphine Gas in the Cloud Decks of Venus” to appear in Nature Astronomy.
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#2
Zinjanthropos Offline
I guess the question here might be whether or not it happened here. I’m sure we have some acid resistant organisms on Earth(acidophiles?)
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#3
C C Offline
Venus Is Dead! New Analysis Shows Phosphine, A Possible Biosignature, Is Absent
https://www.forbes.com/sites/startswitha...9a43550bad

INTRO: In one of the biggest surprises in the history of planetary science, a September 2020 study announced the presence of phosphine gas in Venus’s cloud decks: a tantalizing hint that could be due to biological processes. Phosphine (PH3), which is chemically similar to ammonia (NH3) except with phosphorus standing in for nitrogen, is only produced naturally on Earth by biochemical processes, but was claimed to exist on Venus at the 20 parts-per-billion level. With two separate observatories claiming this detection — both the JCMT and ALMA — the signal appeared to be quite robust.

The discovery raised the exciting possibility that Venus’s clouds are home to life, and that those biological life forms are producing this phosphine. Indeed, photochemical processes from the Sun's radiation, chemical processes from thermodynamic atmospheric effects, and geochemical processes from surface chemistry reactions were all deemed insufficient[ for producing these levels of phosphine.

So, is it life? Maybe. But that’s assuming phosphine is actually present, and a new study has just been submitted that calls the entire detection into doubt. Here’s what it means, and why the evidence that Venus might be anything other than a completely dead, hellish planet might have just evaporated entirely... (MORE - details)
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#4
Zinjanthropos Offline
(Oct 23, 2020 08:02 PM)C C Wrote: Venus Is Dead! New Analysis Shows Phosphine, A Possible Biosignature, Is Absent
https://www.forbes.com/sites/startswitha...9a43550bad

INTRO: In one of the biggest surprises in the history of planetary science, a September 2020 study announced the presence of phosphine gas in Venus’s cloud decks: a tantalizing hint that could be due to biological processes. Phosphine (PH3), which is chemically similar to ammonia (NH3) except with phosphorus standing in for nitrogen, is only produced naturally on Earth by biochemical processes, but was claimed to exist on Venus at the 20 parts-per-billion level. With two separate observatories claiming this detection — both the JCMT and ALMA — the signal appeared to be quite robust.

The discovery raised the exciting possibility that Venus’s clouds are home to life, and that those biological life forms are producing this phosphine. Indeed, photochemical processes from the Sun's radiation, chemical processes from thermodynamic atmospheric effects, and geochemical processes from surface chemistry reactions were all deemed insufficient[ for producing these levels of phosphine.

So, is it life? Maybe. But that’s assuming phosphine is actually present, and a new study has just been submitted that calls the entire detection into doubt. Here’s what it means, and why the evidence that Venus might be anything other than a completely dead, hellish planet might have just evaporated entirely... (MORE - details)

How would you like to be Jane Greaves right now? What happens to her, public ridicule and shamed by scientific community? Would her team be peer reviewed before publishing findings or were they too hasty? If any of her peers recommended publishing would they suffer same fate Jane is facing?
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