Saturn moons align. NASA's Cassini spacecraft has been in Saturn orbit for over a decade and it has seen the whole spectrum of ringed planet delights. But there are few views in Saturnian orbit that are more satisfying than seeing two or more moons in the same frame — particularly when they align.
Phobos in the foreground with gigantic (but very distant) Jupiter sitting in the background, a fortuitous alignment that the Mars Express High-Resolution Stereo Camera team took advantage of on June 1. Phobos and Jupiter ESA/DLR/FU Berlin (G. Neukum) 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!