Cassini captured the images for this mosaic on 12 December 2011. The five images used in this mosaic were taken sequentially, and the background moons shifted positions between frames; this composition does not actually reflect a confluence of moons that happened at one distinct moment in time. From left to right, the ringmoons are Prometheus, Epimetheus, and Pandora.
ESA/DLR/FU Berlin (G. Neukum)
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.