NASA / ESA / STSCI / J.HARRINGTON & K.BORKOWSKI, UMD / SCIENCE PHOTO LIBRARY NASA / ESA / STSCI / J.HARRINGTON & K.BORKOWSKI, UMD / SCIENCE PHOTO LIBRARY
The Cat's Eye Nebula. The planetary nebula known as the Cat's Eye Nebula (NGC 6543) as seen from the Hubble Space Telescope. The shells (red and green) of gas seen here have been expelled by a dying star (blue centre) during the last stages of its life. Astronomers have suggested, in order to explain the intricate features seen in the shells, that another star is orbiting around the dying star. The image is a composite of three exposures taken at red (ionised hydrogen), green (ionised nitrogen) and blue (neutral oxygen) wavelengths and was taken on September 18th 1994.
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