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So will the inhabitants of Alpha Centauri recognize this vessel as something other than Oumuamua?

Given the shape of the solar sail, a new sci-fi story makes this the Veeger where our solar sail collects enough dust due to some unforseen negative ionic charge developing that pulls in galactic dust to make it look like generic rock floating from the Centurian Oort cloud and written off as actual contact from another planet.

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Any civilisation that can detect an object of that size and categorise it as being unnatural in origin would have vastly more advanced technology that would allow them to detect humans on Earth in the first place.

We dtetected Oumuamua.

Oumuamua is a bit larger than a blanket on your couch.

Also, a mirror flying through space is very hard to detect. It reflects very well but only in some directions meaning it is basically black when looking at it from any other direction.

It's also at about the altitude over your head the premise flew by you.

It was a low brow sci-fi premise where the little probe that could collected all sorts of space dust on the 20 year journey increasing its size.

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