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Scientists have found a gas associated with living organisms in a region of Venus' atmosphere. They can't figure out how it got there if it didn't come from life.
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The comet, 2I/Borisov, looks surprisingly like comets closer to home. It's a sign that the processes that formed the sun and planets are at work elsewhere in the universe.
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A surprisingly large planet orbiting a small star defies the conventional wisdom about how planets are born. But a dark-horse idea from more than 20 years ago could explain it.