For nearly a century, scientists have been studying mysterious dark patches in the clouds covering Venus.
These dark areas seem to change shape and swell—scientist Rakesh Mogul likened them to the blobs of wax in a lava lamp.
In 1967 astronomer Carl Sagan suggested that Venusian clouds might support life, Business Insider reported.
Since the clouds were composed of toxic sulfur dioxide and caustic sulfuric acid, scientists were unconvinced.
Then researchers found a bacteria strain on Earth that could both float in clouds and survive a highly acidic environment.
Now scientists are observing Venus’s mottled clouds with fresh interest.