Phobos and Jupiter
Phobos and Jupiter On June 1, 2001, Mars Express watched as Phobos (the inner and larger of Mars' two moons) slipped past distant Jupiter. Phobos is only 23 kilometers in diameter, while Jupiter is 142,000 kilometers across! The image has been rotated from the original so that the south pole of Phobos is down. Stickney crater takes a bite out of the moon to the left. ESA/DLR/FU Berlin (G. Neukum)

"We're changing the world. Are you in?"
- CEO Bill Nye

Sign up for email updates