Saturn

The NASA probe that has spent the past 13 years making countless discoveries about the ringed planet and its moons was taken out of orbit and sent plunging into Saturn's atmosphere.

NASA's probe has spent the past 13 years orbiting Saturn, making a number of important discoveries along the way. On Friday, it will hurl itself into the planet's atmosphere and disintegrate.

"This is the closest we've come, so far, to identifying a place with some of the ingredients needed for a habitable environment," NASA says. There are signs of a promising reaction under the surface.

You may be inclined to see a ravioli, a walnut or an empanada, but it's tough to deny that Pan's distinctive ridge makes a tasty impression. The images were taken by the Cassini spacecraft Thursday.