Claim: Hints of life on Venus: Scientists detect phosphine molecules in high cloud decks


New Member
Hints of Life On Venus - Scientists detect phosphine molecules in high cloud decks

This is my first new post, I'm trying to follow the posting guidelines correctly.
In my opinion the claim that phosphine molecules is indicative of possible alien life is so ridiculous, that it rises to the level of needing debunking. It looked to me like they detected signatures of phosphine molecules at concentrations of around 2 PPB (parts per billion).
The article said:
Some ideas included sunlight, minerals blown upwards from the surface, volcanoes, or lightning, but none of these could make anywhere near enough of it.
With the lack of knowledge that we have about the surface of Venus and the types of chemical reactions that could be in play, to so quickly dismiss these in complete ignorance but yet give preference to an Alien Life hypothesis is unbelievable to me.

Furthermore, if phosphene is a byproduct of a microbial reaction, and it can be detected at 2 PPB, then we should be able to detect the change in sulfuric acid or hydrogen sulfide concentrations that would result from it. They also keep saying "so much phosphene! too much to explain!" But 2 PPB is nothing.

From Wikipedia
"No known source". So why not hypothesize a new abiotic source? Why hypothesize an unknown biological source instead? This type of nonsense is why lay people distrust the scientific community. I guarantee within a few months or years someone will either fail to repeat the observations or come up with a far more plausible abiotic theory. I get so annoyed when the answer to anything knew is always "aliens". I guess this isn't a complete debunk scientifically since I can't prove a negative, but so many of the alternative theories such as lightning and volcanoes are so much more plausible, that I can actually imagine a chemical mechanism for how they can produce phosphine, far more readily than some weird living organism high up in the atmosphere with almost no access to hydrogen.

There's at least a few abiotic methods for producing phosphine on earth. Tell me why this couldn't happen in the atmosphere of Venus instead of by aliens.
Again from Wikipedia
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Amber Robot

Active Member
Although I agree that it is more likely an unknown abiotic source, none of your criticisms seem to actually address their arguments quantifiably. If you “can actually imagine a chemical mechanism for how they can produce phosphine” then you should write a paper showing how your mechanism accounts for the concentration observed. I haven’t fully read their paper yet but my understanding is that they considered abiotic sources but couldn’t account for the observed concentration. They address quantitatively various methods of production (with citations) in their paper. Which calculation of theirs do you take issue with? Having a qualitative objection akin to argument from incredulity won’t cut it in a scientific argument.


Senior Member.
"No known source". So why not hypothesize a new abiotic source? Why hypothesize an unknown biological source instead? This type of nonsense is why lay people distrust the scientific community.

But every professional comment I have heard on this has acknowledged the possibility that there might be other explanations, while also acknowledging that the researchers have addressed the known possible abiotic sources. Even the team leader, Jaane Greaves, said this in a TV interview I saw. So why should this cause anyone to distrust the scientific community, when they seem to be taking exactly the correct fallibilistic approach?

Unless you have evidence to the contrary, both the Greaves group and those examining seem to be doing just what scientific approaches would require.

By chance I was just listening to this excellent podcast on philosophy of science which used the Venus phospine issue as an very good instance of a the way science should address unconceived alternatives.

Edit: I thought I should add a link to the original paper:
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Senior Member.
There are no extraordinary claims in the original scientific report. It is just a media hype.
This here.

The original report emphasizes volcanism as a possible source. It's very hard to pin down how much volcanic activity Venus has, because while it appears to be none right now, it also appears to have been incredibly huge not long ago. Earlier this year there was a report of rising and receding magma domes in the crust - Venus doesn't have tectonic plates and has a thicker crust than Earth, but it has the same mantle activity with nowhere for it to break through. Evidence suggests when an eruption happens it's cataclysmic, the most recent one seems to have resurfaced much of the planet and nothing on the surface is as old as most of Earth's continental crust, meaning its likely happened more than once.

That said, our current beliefs about the planet don't account for the current phosphine levels, but our understanding of volcanoes on Venus is pretty speculative. We don't have a great estimate for how old the surface is, only that it's younger than Earth's continents and the other terrestrial planets, or exactly what happened to renew it.

One of the things happening after this paper is a "prediscovery" search, looking for existing data that also shows phosphine that was missed or ignored (planetary astronomy produces immense data sets and a scientist looking at, say, sulphur reaction chains in the clouds can't chase down every random trace gas signature or they'd never get anywhere), to see if this might be declining, rising, or temporary, all of which would point to geological sources, or if it's steady, which would be the real puzzle.


Senior Member.

So the follow-ups have been coming in. Several other groups have failed to find any phosphine, and going through archival data for pre-discovery detections has come up empty (except for Pioneer-Venus, which tentatively supported phosphine but did not have sufficient data for conclusive results).

Two groups reprocessed the raw data from the original observations, and also did not find phosphine. Both groups identified possible data analysis glitches.

One group suggests an identification error matching a spectral line for sulfur dioxide (abundant in the upper atmosphere of Venus) to phosphine. The original paper *did* address this overlap, this particular line was stronger than it should be relative to other lines from sulfur dioxide, suggesting an additional source (i.e. phosphine) with a line at that frequency. The strong line, however, goes to the other group's reanalysis:

The other suggests a more complicated data processing error, the raw data was unusually noisy and a very high order polynomial was used to filter for noise. The more noise you need to filter, the more complex the math and the greater chance for the processing to introduce artifacts. Using different filtering processes cancelled out the phosphine detection.

And for fun, one of the best sentences I think I've read in a science article:
That's quite the Venn diagram right there.

The short version: This currently appears to be a false alarm caused by poor raw data.
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NorCal Dave

Active Member
Just the musings of a non-scientist, but is this more a sign of our current culture? A world of "influencers". Everybody has to be on Instagram, Facebook, Twitter, LinkedIn, Tumbler, ok, maybe not Tumbler. You have to Google your business, have it listed on Alexa and check your Yelp reviews. You always need more followers and subscribers.

You think you found phosphine? You want a good write up? More money for more research? You better get the hype going.
The team first used the James Clerk Maxwell Telescope (JCMT) in Hawaii to detect the phosphine, and were then awarded time to follow up their discovery with 45 telescopes of the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile.
Right from beginning, finding phosphine on the big telescope leads to being "awarded" time on the really big telescope.

After that, how do they proceed? "Hey, we think we found some phosphine. Anybody else seeing this? And if you do, while it's known to be linked to certain micro-organisms, we should first rule out abiotic sources, especially ones that may happen someplace as different as Venus. Again, assuming anyone can replicate the finding in the first place." Zzzzzz. No, they announced that they found it, speculated on why, advance alien life as distinct possibility and, by listing abiotic sources, but showing that they can't account for amount found, kinda give weight to the alien idea. That's something that's goin to be picked up in the press.

It's like Scientific Instagramming. Maybe? We all want hype. Not "Metabunkers", but in general.

I'm not condemning or excusing. Scientists are people and are part of our culture. They want followers too. Fortunately science, unlike the world of influencers, is ultimately self correcting, as appears to be the case above.


Senior Member.
If anything the influencer era has actually calmed it down because scientists can actually participate and actively knock down stories about their work - generally an article in the journals is noticed in a keyword search and a journalist with a high school understanding (if we're lucky) writes it up, pulling answers to any "questions" from scholarly articles rather than obtaining them directly.

A good example was the "cephalopods are panspermia aliens" hype from a couple years ago, the scientists involved were right there on every social media platform to explain that in fact their work was the exact opposite. Similar claims that hit the mainstream media cycle even ten years ago were basically unanswerable for the scientists who never made the outlandish claims they were getting attached to them, something that actually ruined a few careers.

Alexandria Nick

Active Member
Right from beginning, finding phosphine on the big telescope leads to being "awarded" time on the really big telescope.
Observation time is a pretty big battle to win, but there's perfectly valid reasons to prioritize one project over another. For instance, they could have pitched it to the observatory that they're is a potential seasonality to the observation.

Amber Robot

Active Member
Right from beginning, finding phosphine on the big telescope leads to being "awarded" time on the really big telescope.

yes. A promising detection on one telescope is quite often a good justification for award for follow up on another telescope. Nothing out of place there. However, it appears that the original detection was very likely a misidentification.

NorCal Dave

Active Member
If anything the influencer era has actually calmed it down because scientists can actually participate and actively knock down stories about their work - generally an article in the journals is noticed in a keyword search and a journalist with a high school understanding (if we're lucky) writes it up, pulling answers to any "questions" from scholarly articles rather than obtaining them directly.
Good point. It cuts both ways. I guess I got caught up in the negative aspect of it.
yes. A promising detection on one telescope is quite often a good justification for award for follow up on another telescope. Nothing out of place there. However, it appears that the original detection was very likely a misidentification.
I'm sure that's true. I guess my takeaway, from the way the quoted article was written, is that, to get more time, one must, understandably, give a good reason. It just seemed like, "hey, we may have found phosphine, but not sure" wasn't going to cut it. "Hey we found phosphine, and that might mean alien life! Can we get on the big 'scope?" is the way it seemed to come across. Again, just from reading the original article as posted.


Senior Member.
but it took CNN only six sentences to get to ALIENS:
They don't write "aliens", they write "life", and ever since the news from Mars, we know that that's going to mean possibly single-cell organisms at best.

"Aliens" is your own interpretation. CNN simply talks about whether Titan may be habitable.
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Senior Member.
"Hey we found phosphine, and that might mean alien life! Can we get on the big 'scope?" is the way it seemed to come across.
The people who decide these telescope allocations are astrophysicists. They'd know there aren't any "aliens" there. They'd understand, "hey, we found phosphine, and that might mean organic chemistry!" It's big news.

The original article quoted in post #1 talks about "microbes".

Alexandria Nick

Active Member
They get to "life" that fast because it isn't the first time it has come up. Titan as potentially populated by microorganisms has been conceptualized for a while now. Modeling biochemistry that uses hydrocarbons as a solvent instead of water produces observable atmospheric markers and those markers have already been detected in Cassini data.


Senior Member.
The people who decide these telescope allocations are astrophysicists.
Also: It wasn't the original team who got time on the better telescopes. The original team hasn't gotten follow up chances yet, only their original set of observations. The follow ups have been from other teams.

Considering how quickly some of the follow ups followed the publication, they probably already had the time booked and noting they had an angle on Venus took time out of their own projects to take a quick set of observations.

Amber Robot

Active Member
I don’t think there have been follow up observations since that paper. One team looked at archival data and another reprocessed the same data and determined a non-detection.


Senior Member.
Nature reports that the original scientists have repeated their analysis and found an error:
The reanalysis, based on radio-telescope observations at the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile, concludes that average phosphine levels across Venus are about one part per billion — approximately one-seventh of the earlier estimate. Unlike in their original report, the scientists now describe their discovery of phosphine on Venus as tentative

This is it:
To summarise: we tentatively recover PH3 in Venus’ atmosphere with ALMA (~5σ confidence). Localised abundance appears to peak at ~5 parts-per-billion, with suggestions of spatial variation. Advanced data-products suggest a planet-averaged PH3 abundance ~1 ppb, ~7 times lower than from the earlier ALMA processing.

How confident is that?
In the social sciences, a result may be considered "significant" if its confidence level is of the order of a two-sigma effect (95%), while in particle physics, there is a convention of a five-sigma effect (99.99994% confidence) being required to qualify as a discovery.

So the phosphine is definitely there. The question is, which sources can account for that quantity? And why does the analysis show regions with more PH3?
One group suggests an identification error matching a spectral line for sulfur dioxide (abundant in the upper atmosphere of Venus) to phosphine.
From the re-analysis paper:
SO2 contamination was already considered in detail by G2020 (see Methods and Figure 4). Because the two transitions are separated by 1.3 km/s but both lines are expected to be a few 2 km/s wide, they will not appear as two separate minima at any spectral resolution. The limit in identification here is the precision of the centroid of the line minimum (calculated in Table 1 of G2020). The intrinsic spectral resolutions of the datasets are 0.034 km/s (JCMT) and 0.069 km/s (ALMA), and the centroids are measured to precision as good as 0.3 km/s. The spectra were shown in G2020 with larger velocity-bins for clarity, but this does not affect the precision. [..] We describe below our conclusion that the feature identified as PH3 can not be explained as SO2, because of the extreme-outlier SO2-abundance this would require, and the incompatibility of the observed line width.
As an analogy, imagine if you had two partially overlapping dartboards and a fuzzy picture of darts sticking in the board, and you're trying to figure out which board the darts were thrown at. Obviously, for each single dart, you won't be able to decide that, but if you consider which bullseye the darts are centered on, you can tell, if your picture shows enough detail. If you see the darts centered on the PH3 target, you'll conclude that this is unlikely to happen by chance ("extreme outlier") if someone throws darts at SO2.

Then the idea is, maybe somebody threw very many darts at the SO2 board, and you're looking at the PH3 board and seeing lots of darts and then wrongfully conclude that that's what they aimed at. But for that to work, you'd have to have very many darts thrown at SO3:
V2020 consider that the JCMT feature can be fully reproduced by a mesospheric abundance of ~100 ppb of SO2, reading such a value off the altitudinal molecular-abundances plot shown as Extended Data Figure 9 in G2020.

To address this point, we re-examined the JCMT data. Figure (f2) shows the spectrum obtained by G2020 (in the mid-range |v| = 5 km/s reduction), overlaid with a linearly-scaled version of our radiative transfer model of the proposed SO2 line, after baseline-subtracting this model in the same way performed as on the data. The required SO2 abundance to reproduce the whole feature would in fact need to be ~150 ppb, not 100 ppb.

This value of ~150 ppb would be an extreme outlier in millimetre-waveband monitoring observations. (We note some higher literature abundances derived from UV/IR observations; see discussion of data tracing the cloud top1 and over time3 .). Comparing to a large compilation of millimetre-derived SO2 abundances4 , a value of 150 ppb would be a > +6σ outlier – in fact, the highest value recorded over several years was only 76 ppb, half this value. SO2 would also need to be sustained at this very high level over the week of the observations, while it is normally seen to vary on timescales of hours to days.

When I saw the phrase “twelfth order polynomial” I knew it was over.
The re-analysis covers this:
Extended Data Figure 4b in G2020 showed that new features were not produced in the ALMA spectra by polynomial subtraction (however, there were issues with the bandpass calibration, see Section 2 below). Specifically, in G2020 we applied the same reduction procedures to regions of the passband offset by 400 spectral channels either side of the phosphine’s expected location. This produced narrow artefacts spanning only ~2 channels, much less broad than the real line, and comprising only ~18% of the real line’s line-integrated signal. Narrow artefacts of this sort are not physically representative of spectral lines from Venus’ clouds.

In their point S2, V2020 applied a polynomial fit to their reduction of the ALMA data. They included all the antenna baselines, whereas G2020 omitted baselines that were substantially noisier, of <33m. Figure FS1 of V2020 demonstrates fitting a 12th -order polynomial baseline, with the residual creating an artifical “line” feature.

This procedure used by V2020 is not correct in context. G2020 noted the very strong ripple when all the ALMA antenna-baselines were included, and page 3 of the SI describes the decisions made in excluding short baselines (balancing random noise and systematic ripple). When V2020 include all the antenna-baselines, they recover this very strong ripple. It is then inevitable that they can produce a “fake line” by fitting across a section of the passband, ignoring the actual shape of the data.

Further, the correct polynomial order is defined by the number of changes of direction of the spectral baseline within the passband. As this value appears to be 7 in V2020’s Figure FS1 (left), the correct order would be 8. By fitting a 12th order polynomial designed for different data, they have given the polynomial function excess freedom, generating an unstable solution.

Fitting polynomials is not a method we would use when the spectrum is dominated by large systematic ripples. These ripples are produced on the short antenna-baselines, and including these also raises the noise substantially.

In short, the researchers are accusing their critics of using a bad method that creates an erroneous signal from noise, and then using that as evidence against them. They say that they didn't use that method at all; if they use their own methods, they're finding smaller artifacts that can't be mistaken for a signal.

There is another reference to 12th-order polynomials on page 9 that I don't fully understand. It seems to be part of the calibration of the sensor using Jupiter's moon Callisto. The team is hoping to get a better calibration with next year's observations:
The intent is to re-observe Venus with optimum settings after the re-opening of ALMA in 2021. Such observations can include optimising the selection and use of calibrators; using a small mosaic and total power observations if Venus fills the primary beam; and applying a more recent higher-precision primary beam model, needed to accurately extract faint absorption lines across the planet. In the meantime, the data gathered in March 2019 has been reprocessed to resolve some of the processing issues in the data used in G2020.

The data sets that have turned up in the meantime are apparently quite diverse.
Temporal variation is now required to reconcile all the available PH3 data. [..] The overall compilation of data could thus be reconciled with a PH3 profile decreasing with altitude, and temporal variations of at least an order of magnitude.

The diversity is such that you'd have to assume that the PH3 concentration changes strongly over time and with altitude for all the detected values to be correct, which feels like a cop-out.

Hopefully, next year's observations can provide more insight here.
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Active Member
A new study pours cold water on Venus phosphine. It's on ArXiv at the moment but from what I've read it's been accepted for publication by the Astrophysical Journal.

Claimed detection of PH3 in the clouds of Venus is consistent with mesospheric SO2​

Andrew P. Lincowski, Victoria S. Meadows, David Crisp, Alex B. Akins, Edward W. Schwieterman, Giada N. Arney, Michael L. Wong, Paul G. Steffes, M. Niki Parenteau, Shawn Domagal-Goldman

The observation of a 266.94 GHz feature in the Venus spectrum has been attributed to PH3 in the Venus clouds, suggesting unexpected geological, chemical or even biological processes. Since both PH3 and SO2 are spectrally active near 266.94 GHz, the contribution to this line from SO2 must be determined before it can be attributed, in whole or part, to PH3. An undetected SO2 reference line, interpreted as an unexpectedly low SO2 abundance, suggested that the 266.94 GHz feature could be attributed primarily to PH3. However, the low SO2 and the inference that PH3 was in the cloud deck posed an apparent contradiction. Here we use a radiative transfer model to analyze the PH3 discovery, and explore the detectability of different vertical distributions of PH3 and SO2. We find that the 266.94 GHz line does not originate in the clouds, but above 80 km in the Venus mesosphere. This level of line formation is inconsistent with chemical modeling that assumes generation of PH3 in the Venus clouds. Given the extremely short chemical lifetime of PH3 in the Venus mesosphere, an implausibly high source flux would be needed to maintain the observed value of 20±10 ppb. We find that typical Venus SO2 vertical distributions and abundances fit the JCMT 266.94 GHz feature, and the resulting SO2 reference line at 267.54 GHz would have remained undetectable in the ALMA data due to line dilution. We conclude that nominal mesospheric SO2 is a more plausible explanation for the JCMT and ALMA data than PH3.

In practice, what they say is that the spectral line detected at 266.94GHz and attributed to phosphine (which has a line at 266.944GHz) has been confused with the sulphur dioxide line at 266.943GHz. The authors of the original phosphine detection (Greaves et. al.) article were of course well aware of this possibility, which they ruled out because observations made at ALMA observatory failed to find a nearby sulphur dioxide line. They deduced SO2 concentration had to be low and not able to explain the 266.94GHz line without phosphine.

Lincowski et. al. (the new study) reanalysed the ALMA data and found contradictions with the known abundance of SO2 on Venus. From this they deduced (modelling Venus atmosphere) that the signal at 266.94GHz did not come from Venus clouds, but much higher, where phosphine would be destroyed by solar radiation with a lifetime less than 1 second (this does not happen to SO2).

These are the conclusions of the paper of Lincowski et. al.:

5.CONCLUSIONS We simulated millimeter-wavelength Venus spectra to ex-plore the vertical distribution and detectability of PH3andSO2in the Venus atmosphere. We find that the observa-tions of the 266.94 GHz absorption line are insensitive to theabundance of PH3and SO2within the cloud deck. Instead,the observed absorption at this wavelength originates fromthe mesosphere at altitudes above 80 km. At these altitudes,PH3would be rapidly destroyed, such that 20±10 ppb of PH3 would require a flux of PH3to the Venus mesospherethat is∼100 times higher than the global production rate of photosynthetically-generated O2on Earth. Because PH3and SO2both absorb within the width of the line detectedat 266.94 GHz, we emphasize that the identification of this absorption line as due to PH3in both the ALMA and JCMTdata relies heavily on the apparent low abundance of SO2inferred from the non-detection of an SO2reference line at267.54 GHz in the ALMA data. However, we show thatSO2absorption is likely heavily suppressed in the ALMAdata. Using SO2vertical profiles within the range of previ-ous observations (from 30 ppb at 78 km to 400±150 ppb at100 km)—including SO2observations taken within a monthof the JCMT data—our model can fit the depth and widthof the 266.94 GHz feature without PH3. We also show thatALMA line dilution suppresses the values for nominal Venusmesospheric SO2to below the corresponding detectabilitylimit set by Greaves et al. (2020a). Given the mesospheric al-titude range, short chemical lifetime of PH3, and consistencywith existing mesospheric SO2abundances observed within amonth of the JCMT observations, we argue that SO2provides a more self-consistent explanation for the 266.94 GHz feature than PH3. Single dish observations optimized for Venusand used to assess the PH3detection and SO2abundance inthe Venus upper mesosphere should be prioritized to discrim-inate between PH3or SO2as the source of the 266.94 GHz line.

It looks like another case of 'crying life', of which we had already too many from Lovell's Mars canals to meteorite ALH84001.
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