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In a nutshell, it was observed that Oumuamua did not slow down quite as much as it should have as it was leaving. That's what these guys are trying to explain as the behavior of a light sail. The trouble is that same behavior would cause it to not speed up quite as much as it should have as it approached.
originally posted by: Zadiel74
I was reading a reddit thread yesterday, and someone theorized, if Oumuamua is artificial, it's more likely to be a type of jettisoned booster rocket type device, that detached for final approach.
Be afraid for what you wish for???
The tumbling is based on the fact that the light levels from the object were variable, a characteristic of tumbling objects in space.
There is a Ted Talk on Oumuamua and they said it was spinning in all sorts of directions, so how could a sail do that?
Our inferred thin geometry is consistent with studies of its tumbling motion. In particular, Belton et al. ( 2018 ) inferred that ‘Oumuamua is likely to be an extremely oblate spheroid (pancake) assuming that it is excited by external torques to its highest energy state.
Oh, it hasn't been eliminated, because it can't be. It's just a lot more likely to be a comet-like thing. But we'll never know for sure. How cool is that?
How did "spaceship" get eliminated from the list of what it could be?