An Unexpected Discovery On The Surface Of Rosetta's Comet

Scientists have presented their initial observations of Comet 67P/Churyumov-Gerasimenko in seven articles published Thursday in the journal Science. Among the more surprising finds: images of ripples and dunes on the comet's surface, unexpected given that the comet lacks an atmosphere (and therefore wind) and… » 1/22/15 3:30pm 1/22/15 3:30pm