J.P. Harrington and K.J. Borkowski (University of Maryland), and NASA
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This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.
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The "Cat's-eye" nebula, NGC 6543, is a planetary nebula: the gas emitted at high speed from the surface of a star which is in the process of becoming a white dwarf. This one is complex possibly due to a binary companion's influence.