2 Comets Collided to Form Rosetta's 'Rubber Ducky' Target

The strange shape of Comet 67P/Churyumov-Gerasimenko, which the European Space Agency's Rosetta spacecraft has been studying for more than a year, arose from the long-ago collision of two separate, slow-moving comets, researchers say. "How the comet got its curious shape has been a major question since we first saw it," Holger Sierks, of the Max Planck Institute for Solar System Research in Germany, said in a statement. "Now, thanks to this detailed study, we can say with certainty that it is a