But the unusual behaviour of the sulphur in Venus’ atmosphere - which suddenly disappears in the outer layers - cannot be explained by an ‘aerial’ form of extra-terrestrial life.
Researchers used a combination of atmospheric and biochemical models to study the chemical reactions expected to occur, given the known sources of chemical energy in Venus’s atmosphere.
Scientists ran the model found that the reactions can result in a drop in SO2 levels, but only by producing other molecules in very large amounts that are not seen.