‘Oumuamua, a small interstellar object first discovered by humans on October 19, 2017, that was highly luminous, oddly tumbling, and most likely disk-shaped, deviated from a path explicable by the Sun’s gravity alone without any visible outgassing. All of its properties, very much including its origin in space-time being local standard of rest, rendered it a statistical outlier to a highly significant degree. As a member of a population of objects on random orbits, it required much more solid material to be expelled than available in planetary systems around other stars. But if ‘Oumuamua was
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