University of Maryland scientists believe they see sinkholes on the surface of comet 67P/Churyumov-Gerasimenko. The Rosetta spacecraft began orbitting the comet in August 2014. It sent back images of the surface of almost perfectly round circular pits.
The pits are large, ranging from tens to several hundred meters in diameter. The pits are believed to be sinkholes that form similar to the way sinkholes occur on Earth.
We propose that they are sinkholes, formed by a surface collapse…” said Dennis Bodewits, University of Maryland scientist. “These strange, circular pits are just as deep as they are wide. Rosetta can peer right into them