Hyperion is a weird little moon, tumbling chaotically around Saturn and looking for all the world like a giant sea sponge. It’s spongy inside too — judging by its density and composition, planetary scientists have deduced that it’s more of a giant rubble pile than a solid world.
The Cassini spacecraft has been a marvel especially for Hyperion, returning by far the best images ever taken of the little lump. But this last May saw its final visit to Hyperion, a distant flyby at 34,000 km on May 31. So, let’s all say farewell to this weird little rock for now: