Rare Alignment of Triple Eclipses on Jupiter

There are 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.

Io's - Shadow is located just above center and to the left, it is the white circle in the center of the image.

Ganymede's - Located on the planet's left edge, it is the blue circle at upper right.

Callisto's - Present near the right edge. Callisto is out of the image and to the right.

Only two of the moons, however, are visible in this image. This image was taken with Hubble's Near Infrared Camera and Multi-Object Spectrometer.