Oumuamua - Harvard astronomer argues that alien vessel paid us a visit

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https://www.thehindu.com/sci-tech/science/harvard-astronomer-argues-that-alien-vessel-paid-us-a-visit/article33773544.ece

Mysterious visitor

Loeb, 58, lays out the argument for the alien origins of the object named 'Oumuamua — "scout" in Hawaiian — in "Extraterrestrial: The First Sign of Intelligent Life Beyond Earth."

The facts are as follows.

• In October 2017, astronomers observed an object moving so quickly, it could only have come from another star — the first recorded interstellar interloper.
• It didn't seem to be an ordinary rock, because after slingshotting around the Sun, it sped up and deviated from the expected trajectory, propelled by a mysterious force.
• This could be easily explained if it was a comet expelling gas and debris — but there was no visible evidence of this "outgassing."
• The traveler also tumbled in a strange way — as inferred by how it got brighter and dimmer in scientists' telescopes, and it was unusually luminous, possibly suggesting it was made from a bright metal.

[RoadRomeo]