COLLEGE PARK, Md., July 1 (UPI) -- An in-depth study of images captured by the Rosetta probe in 2014 has revealed a series of pits on the surface of comet 67P to be sinkholes.
The new research suggests the comet's surface is highly active. In addition to shedding debris and expelling inner vapors as it approaches the sun, the comet is undergoing rapid structural changes.