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Interstellar comet 3I/ATLAS shows methane as it heads out of solar system
A comet born around another star is carrying methane, and the chemical details of that methane are unlike anything ...
In 2017, ‘Oumuamua appeared in the sky as the first confirmed interstellar object. We still aren't entirely certain what ‘Oumuamua was—though we can be mostly certain it wasn't an alien spacecraft.
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