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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 ...
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Scientists scanned 3I/ATLAS for alien signals, here's the result

The third known visitor from another star system, Comet 3I/ATLAS, has been racing through the Solar System with just enough weirdness to ignite a familiar debate: is it natural or could it be ...