‘Oumuamua still puzzling scientists 5 years after discovery

Five years after spotting the first known object from beyond our solar system passing through, scientists are still figuring out what the strange object says about planetary systems.

Marauding ice giant planets like Neptune could be flinging many trillions of small bodies into interstellar space, some of which visit our solar systemas ‘Oumuamua notably did in 2017. If true, then the population of such rogue objects moving between the stars could be in the hundreds of trillions of trillions (that’s a digit followed by some 26 zeroes).

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