Imagine this scenario: On a world orbiting a neighboring star, a society more advanced than our own has used large telescopes to survey all the planets within a few hundred light-years. In this sample of a million worlds, it finds that one percent show the tell-tale atmospheric gases that indicate life. One of these is Earth.
Imagine this scenario: On a world orbiting a neighboring star, a society more advanced than our own has used large telescopes to survey all the planets within a few hundred light-years. In this sample of a million worlds, it finds that one percent show the tell-tale atmospheric gases that indicate life. One of these is Earth.
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