It’s been about a year since the mysterious interstellar asteroid (or maybe comet) Oumuamua passed through our Solar System. It was going so fast and was so far away that astronomers could see very little before it was off and away into deep space again.
The strange motions of the object as it zipped through the Solar System have left astronomers puzzled about what it is, and some interesting theories are continuing to come out to explain it. And one really extreme idea is that it could be a solar sail sent from another civilization.
Solar Sail image by Andrzej Mirecki
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