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Happy Halloween from space! This ghoulish space cloud is known as the "Ghost of Cassiopeia." The nebula lurks some 550 light-years from Earth in the constellation Cassiopeia, where powerful radiation from a nearby star is slowly causing its clouds to dissipate. Astronomers used the Hubble Space Telescope to captured this image, which was released last year just before Halloween. (This year, Hubble scientists released another special Halloween image of a more creepy-looking space ghost.) — Hanneke Weitering