Three moons and their shadows parade across Jupiter — beginning of event

This new NASA/ESA Hubble Space Telescope image captures a rare occurrence as three of Jupiter’s largest moons parade across the giant gas planet’s banded face.

The image shows the Hubble observation at the beginning of the event. On the left is the moon Callisto and on the right, Io. The shadows from Europa, which cannot be seen in the image, Callisto and Io are strung out from left to right.

The movement of the moons is shown in the video created from Hubble stills and an annotated version is also available.