In the image NASA released of Charon yesterday, astronomers pointed out a collection of vaguely-defined features on the surface of Pluto's biggest moon. Now, with this latest capture, the New Horizons team has confirmed that the big dent in the icy rock's surface is in fact an impact crater, surrounded by a couple of deep canyons—one larger than Earth's Grand Canyon.

Get ready for even more detailed images of Charon and its orbital buddy, Pluto, tomorrow morning when New Horizons makes its closest approach to the system. Geologists will be especially interested to take a closer look at the dark spot on the moon's northern pole, and the rays of material you can see spraying out from the edges of the crater.