Juice Mission: why has the search for alien life moved to Jupiter’s moons?
Science Weekly
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The Evolution of the Search for Life on Earth
Astronomers are trying to find anywhere in the solar system where there's large bodies of water. In order to be absolutely certain that you've got a life form, you could look for its metabolic gases. They tried this on Mars in the 1970s to see if there were microbes in the Martian soil. Most people believe that those results that came back indicated that there weren't.
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