Astronomy Picture of the Day . Halo of the Cat's Eye . ... The Cat's Eye Nebula (NGC 6543) is one of the best known planetary nebulae in the sky. ... A Dust Devil on Mars . ... Does the surface of Mars change? ... Pictured above are not aurora but nearby light pillars, a local phenomenon that can appear as a distant one. ... The Hubble Deep Field . ... Launched twenty-five years ago, NASA's Voyager 1 and 2 spacecraft are now over 10 billion kilometers from the Sun. ...