‘Oumuamua Was Neither Comet nor Asteroid…So What Was It?

Like a hit-and-run driver who races from the scene of a crash, the interstellar guest known as ’Oumuamua has bolted out of the solar system, leaving confusion in its wake. Early measurements seemed to indicate that it was an asteroid—a dry rock much like those found orbiting between Mars and Jupiter. Then by this past …

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