Scientists say Earth Impacts May Have Delivered Microbes to the Clouds of Venus
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Facebook X LinkedIn Reddit WhatsApp Flipboard Bluesky Email Copy Link Home → Space New models suggest Earth microbes may briefly survive in Venus’s clouds.
For centuries, humans have been wondering whether anyone lived on Venus. In the 1960s, telescopes delivered bad news: Modern-day Venus is thoroughly hostile to life, shrouded in thick acidic clouds and sweltering at 900°F. However, the question remained whether Venus started its life as a more habitable planet before a runaway greenhouse gas effect baked it dry.
Some have even wondered whether life or its main ingredients first appeared on Venus, only to be spread to Earth following a meteorite impact that would have flung debris out into space. A new study approaches that question from the opposite angle. Rather than looking for signs whether Venus was ever habitable, the researchers modeled whether impacts on ancient Earth could have blasted microbe-bearing rocks into space, with some fragments eventually falling into Venus’s atmosphere.
Their results suggest that, at least in principle, a small number of terrestrial cells could have reached the planet’s cloud layers — a region far above the scorching surface where temperatures and pressures are less extreme. That would not make Venus habitable in any simple sense. Nor would it prove that Earth actually seeded its neighbor.
But it adds a strange possibility to the search for life there: if future missions ever detect biology in Venus’s clouds, scientists may have to ask not only whether Venus was once alive, but whether Earth sent life there. Venus is often called Earth’s sister planet. It is nearly the same size and made of similar rocky material.
But the resemblance ends fast. Venus has a crushing atmosphere, sulfuric acid clouds, and a surface hot enough to melt lead. It looks like one of the worst places in the solar system to search for life.
Some layers of Venus’s clouds have temperatures and pressures closer to those on Earth. That does not make them friendly. The clouds are acidic and dry.
Still, researchers have wondered whether hardy microbes could survive there for short periods. The new study adds another layer by asking whether microbes from Earth could reach those clouds through panspermia—the proposed spread of life between worlds by rocks, asteroids, or comets.
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