Caves seen on the surface of a comet for the first time

We have spotted caves on a comet for the first time. The caves, identified on comet 67P/Churyumov-Gerasimenko – also known as comet 67P – are full of ice, which could help explain mysterious jets that astronomers have seen coming from the comet.

While we know roughly what comets are made of – commonly rock, ice and frozen gases – we don’t know much about their internal structure. Caves could offer an easy access point for scientists to learn about this interior, but unlike many planets and bodies in…