Harvard Scientists Say Aliens May Explain Bizarre Interstellar Object 'Oumuamua (But Probably Not)

Oddball space rock 'Oumuamua, discovered over a year ago, is the first interstellar object to visit our solar system and is unlike any comet or asteroid observed before. Two astronomers with the Harvard-Smithsonian Center for Astrophysics (CfA) recently took a closer look at the cigar-shaped object's unusual acceleration during its trip through our solar system, to figure out what may have caused the unexpected boost in the object's motion. Such acceleration during orbit is characteristic of comets, because their icy bodies evaporate, expelling water vapor that propels the objects.

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