A number of the dust jets emerging from Rosetta’s comet can be traced back to active pits that were likely formed by a sudden collapse of the surface. These ‘sinkholes’ are providing a glimpse at the chaotic and diverse interior of the comet.
via ESA Space Science
http://www.esa.int/Our_Activities/Space_Science/Rosetta/Comet_sinkholes_generate_jets
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