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Yeah, there have also been some other odd historical objects like [https://www.astronomy.com/space-exploration/how-a-long-gone-...]

In that case they figured out what it was when a spectrograph of the surface light showed it was - painted! Hah.



> In that case they figured out what it was when a spectrograph of the surface light showed it was - painted! Hah.

Good they caught it now, though I figured all the paint has long been eaten away by UV rays.




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