shifting dunes

Here's something we never thought we'd see on a comet: shifting dunes

Here's something we never thought we'd see on a comet: shifting dunes

The Rosetta mission’s close-up views of the curiously-shaped Comet 67P/Churyumov-Gerasimenko have already changed some long-held ideas about comets. But here’s more: there’s a ‘wind’ blowing across the comet’s surface, creating moving shifting dunes.