Boulders balance on tiny tips as comet 67P zooms through space

Three boulders (shown) balance precariously on comet 67P/Churyumov-Gerasimenko in this Sept. 16 image taken 29 kilometers above the surface by the Rosetta spacecraft

Rosetta/ESA, MPS for OSIRIS Team/MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

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