A rock is teetering on a comet's surface, but how it got there is a mystery

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A probe orbiting a comet speeding through deep space may have spied something a little odd: a huge, balancing rock on the comet's surface.

The European Space Agency's Rosetta spacecraft snapped a photo of a boulder that appears to be balancing on Comet 67P. The large boulder is about 98 feet in diameter, a little longer than an NBA basketball court.

See also: Rosetta beams back more incredible comet photos

“How the potential balancing rock on the comet was formed, is not clear at this point," Holger Sierks, the principal investigator on Rosetta's OSIRIS camera instrument, said in a statement. Read more...

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