An article published in the journal “Nature” describes research that led to the confirmation of the presence of water ice exposed on the surface of the comet 67P/Churyumov-Gerasimenko. The VIRTIS instrument on ESA’s Rosetta space probe recorded the data that were analyzed to determine the composition of the surface top layer, which is mainly a dark material, dried and rich in organic substances containing a small part of water ice. On the comet there’s a lot of ice but it’s interesting to examine that on the surface because it allows us to understand better some of its creation processes, even underground.