In late 2017, our Solar System received its very first known interstellar visitor: a bizarre cigar-shaped object hurtling past at 44 kilometers per second, dubbed 'Oumuamua (Hawaiian for "messenger from afar arriving first").Was it a comet?An asteroid?A piece of alien technology?Scientists have been puzzling over the origin and unusual characteristics of 'Oumuamua ever since, most notably its strange orbit, and suggesting various models to account for them.
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