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Has the solar system already been visited by an alien emissary?

Why physicist Avi Loeb thinks there’s a “serious possibility” that ‘Oumuamua was an alien spacecraft

‘..[W]hen a bizarrely fast, cigar-shaped interstellar object jetted past Earth on its trip through our solar system, Harvard professor Avi Loeb believes scientists weren’t ready to seriously consider that it was of artificial origin. But Loeb is beyond consideration — he says it’s very possible that ‘Oumuamua (pronounced “oh moo ah moo ah”) was an interstellar spacecraft.

Back in October 2017, a postdoctoral researcher named Robert Weryk at the University of Hawaii was sifting through the usual data stream from the Pan-STARRS astronomical survey of the sky when he noticed an unexpected object. It appeared to be highly elongated, like a stick, with a long axis 10 times longer than its short axis — unprecedented for an asteroid. Some hypothesized that ‘Oumuamua swung towards our solar system as a result of a gravitational slingshot of a binary star system; others, that it might be an odd comet, though no tail was evident. Thus the search began to collect and analyze as much data as possible before it left our solar system.

Immediately upon discovering its physical properties, researchers realized its shape — which would minimize abrasions from interstellar gas and dust — would be ideal for an interstellar spacecraft. The idea understandably sent shockwaves through the scientific community and stoked controversy. Ultimately, scientists coalesced behind the idea that it was of natural origin, rather than artificial.  But Loeb, who is the former chair of astronomy at Harvard University, remains certain that it was something akin to a light sail — a form of interstellar propulsion — spacecraft created by an extraterrestrial civilization. So much so that he wrote a whole book about it.

That book would be “Extraterrestrial: The First Sign of Intelligent Life Beyond Earth,” in which Loeb argues that the scientific community’s resistance to discussing the possibility of extraterrestrial life has hindered taking seriously his hypothesis that ‘Oumuamua was an alien light sail. Loeb reflects on how what happened with ‘Oumuamua was a bit of a missed opportunity, and that academia must invest more in the search for life in our universe to better prepare us for another interstellar visitor. But perhaps, most importantly, in a time when Earth faces an urgent global warming crisis, Loeb says that it could be finding extraterrestrial life that saves us from ourselves….’

— via Salon.com