Researchers using the Visible, InfraRed and Thermal Imaging Spectrometer aboard ESA’s Rosetta spacecraft have identified a region on the surface of 67P/Churyumov-Gerasimenko where water ice appears and disappears in sync with its rotation period. The scientists report on this discovery in the current issue of the journal Nature. Water-ice cycle of Comet 67P/Churyumov-Gerasimenko. Left, top: 67P/Churyumov–Gerasimenko based on four images taken...