Astronomers' research suggests a mysterious interstellar object could be unnatural, even alien.
It's been dubbed a comet, an asteroid, and a new class of interstellar object. Now, a paper from Harvard astronomers suggests one more possibility into the mysterious object nicknamed "Oumuamua": Alien probe.
Researchers focused on whether solar radiation pressure could explain the unusual acceleration of "Oumuamua," the first object entering the Earth's solar system from interstellar space.
The paper said if solar radiation pressure is the reason "Oumuamua" is moving at high speeds, it represents "a new class of thin interstellar material" either made naturally or through artificial means.
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