This time-lapse animation of Hubble observations shows the rotation of Saturn and six of its moons over roughly 20 hours. In a textbook demonstration of Keplerian motion, the moons closer to the planet orbit more rapidly, while those farther away move more slowly.

NASA, ESA, A. Simon (GSFC) and the OPAL Team, and J. DePasquale (STScI)

Publication: July 26, 2018