Mysterious circles appear, grow on comet

Rosetta spacecraft spotted five round depressions in June, early July

comet circles

SEE SPOT GROW  The first of five growing circles on comet 67P appears in a June 5 image from Rosetta (left). By June 23, two spots were spreading across the surface (center). They were joined by a third on July 2 (right).

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

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