A RARE ECLIPSE OF JUPITER'S MOONS: It may be the weirdest eclipse you've ever seen. Three days ago near Jupiter, the shadow of Callisto almost swallowed Ganymede--and it's about to happen again. Eclipse season is underway among Jupiter's moons. Movies and observing tips are featured on today's edition of Spaceweather.com.
Above: The shadow of Callisto passes across Ganymede on April 19, 2021. Credit: Anthony Wesley.
