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[–] carlip 0 points 0 points (+0|-0) ago 

perhaps the beginning of an aricebo like telescope

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[–] TheBuddha 0 points 0 points (+0|-0) ago 

Aliens...

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[–] xyzzy 0 points 0 points (+0|-0) ago 

A roundabout.

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[–] 137 1 points -1 points (+0|-1) ago 

Looks like an old foundation.