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Hubble Telescope Captures Image of Sauron's Eye The Cat's Eye Nebula was the first planetary nebula ever to be discovered but its complex gas layers give knots and jets like the Lord of the Ring's famous floating eye of Sauron.    Astrobiology Magazine -- A new study of a large number of planetary nebulae has revealed that rings, such as those seen here around the Cat's Eye Nebula, are much more common that thought so far and have been found in at least one third of all planetary nebulae... 