... Shapley 1: An Annular Planetary Nebula . ... The center condenses into a white dwarf while the outer atmospheric layers are expelled into space and appear as a planetary nebula. ... Messier 65 (M65) is a bright spiral galaxy of stars only 35 million light-years away in the constellation Leo. ... Infrared Horsehead . ... This remarkable line of 13 closely spaced craters on Jupiter's moon Ganymede was photographed by the Galileo spacecraft in 1997. ... What happens when a comet encounters a planet? ...