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A Hot Pink Shell Of My Former SelfCredit: Canada-France-Hawaii Telescope/CoelumTuesday, September 4, 2012: Sh2-188, a planetary nebula, consists of a one-sided shell of material colliding with the interstellar medium, triggering shock wave structures. The planetary nebula phase is a short period during the evolution of a sun-like star in which for some tens of thousands of years the star ejects its outer layers into outer space. (Planetary nebulas have nothing to do with planets, but were misnam
NGC 6543 Halo of the Cat's Eye. The Cat's Eye Nebula is one of the best known planetary nebulae in the sky. Its symmetries are seen in the very central region of this false-color picture, pro-cessed to reveal the enormous but extremely faint halo of gaseous mater-ial, over 3 ly across, which surrounds the brighter, familiar planetary nebula. Made with data from the Nordic Optical Telescope, Canary Islands.