Comets are colliding and kicking up dust around a dead star at the center of the Helix nebula, according to new observations from NASA's Spitzer Space Telescope. The dead star appears as a dot in the middle of the nebula, like a red pupil in a green monster's eye. The Helix nebula is located about 700 light-years away in the constellation Aquarius. It was formed when a star much like our sun died. This nebula won't last long. In about 10,000 years, its shiny clouds will fade, leaving the white dwarf and its circling comets to cool down alone in empty space.