Add Yahoo as a preferred source to see more of our stories on Google. For almost a decade—ever since 2017, when our first known interstellar visitor, 1I/'Oumuamua, swooped through the inner solar ...
For almost a decade—ever since 2017, when our first known interstellar visitor, 1I/‘Oumuamua, swooped through the inner solar system—astronomers have been grappling with a small but stubborn mystery.
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