The Cat's Eye Nebula . ... Credit Copyright: J.P. Harrington and K.J. Borkowski ( U. Maryland ), HST , NASA Explanation: Three thousand light-years away, a dying star throws off shells of glowing gas. This image from the Hubble Space Telescope reveals The Cat's Eye Nebula to be one of the most complex planetary nebulae known. In fact , the features seen in the Cat's Eye are so complex that astronomers suspect the bright central object may actually be a binary star system . ...