Rare Hubble Shot of Jupiter and Moon Shadows

NASA Hubble Space Telescope Spots Rare Triple Eclipse on Jupiter

“Five spots – one colored white, one blue, and three black – are scattered across the upper half of the planet. Closer inspection by NASA’s Hubble Space Telescope reveals that these spots are actually a rare alignment of three of Jupiter’s largest moons – Io, Ganymede, and Callisto – across the planet’s face. In this image, the telltale signatures of this alignment are the shadows [the three black circles] cast by the moons.”