A cigar-shaped space rock named 'Oumuamua caused quite a stir when it became the first interstellar visitor discovered in our solar system. Is it an asteroid, a comet or an alien spacecraft? Whatever it is, it's probably not unique.
A cigar-shaped space rock named 'Oumuamua caused quite a stir when it became the first interstellar visitor discovered in our solar system. Is it an asteroid, a comet or an alien spacecraft? Whatever it is, it's probably not unique.
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