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Cool image time! Rosetta’s high resolution camera has discovered a group of balancing rocks on the surface of Comet 67P/C-G.
The image on the right, cropped and brightened by me, shows the most dramatic of these rocks. The scientists are as yet uncertain on how these rocks got to where they are.
“How this apparent balancing rock on Comet 67P/C-G was formed is not clear at this point,” says OSIRIS Principal Investigator Holger Sierks from the Max Planck Institute for Solar System Research (MPS) in Germany. One possibility is that transport processes related to cometary activity played a role, causing such boulders to move from their original site and reach a new location.
It is also possible that the rocks were sitting on a base of ice that simply evaporated away over time.