[willis936]

I didn’t hear any geological explanations in the press conference. It would be interesting if there was some chemical process happening deep under the surface, where the necessary pressures are present, then have it introduced into the atmosphere through seismic activity. I’m not too familiar with Venus’s geology. I don’t think the core is molten, but the tidal forces from the sun must be significant.

[ufo]

The Sun's tidal forces on Venus are only 2.6x the Sun's tidal forces on the Earth, which is less than the tidal forces we get from our moon.

(This estimate assumes that tidal forces are proportional to 1/R^3 and that the orbital radius of Venus is 73% of Earth's)

[cowboysauce]

The authors of the paper estimated that at least 200 times more volcanic activity than what’s present on the Earth would be required to release that much phosphine into the atmosphere. It’s almost certain that there are active volcanos on Venus, but that much activity is unlikely to have gone unnoticed.

[jandrese]

If there was that much volcanic activity we'd expect the atmosphere to be contaminated with ash wouldn't we?