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How to Make a Rubber Ducky Comet: Smash Two Comets Together! Carefully.

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Close-up of comet 67P

A close-up of 67P shows flat terraces (colored green here) and layers (red).

Credit: SA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA; M. Massironi et al.

It was a bit of a surprise when the Rosetta probe, after a decade of travel around the Sun, approached the comet and sent the first decently resolved pictures of it back to Earth.

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