Image of the Day

1 of 22

I'm Being Followed By Moon Shadows

Credit: Efrain Morales Rivera
Thursday, Jan. 29, 2015: Astrophotographer Efrain Morales Rivera of Aguadilla, Puerto Rico, sent in a composite photo showing the rare triple shadow transit…Read More »

of Jupiter's moons, Io, Callisto and Europa, on Jan. 24, 2015. These transits occur when the natural satellites of Jupiter pass in front of the sun, as seen from the planet. When the larger Galilean satellites do so, their shadows can be seen from Earth. A triple shadow transit occurs on Jupiter only about once or twice a decade, on average, and the next one will occur in 2032. The smaller photos in the image show the progression of the event, starting at the left and moving clockwise.

— Tom Chao   Less «
More from