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The spectacular structure of Planetary nebula NGC 2818 contains the outer layers of a star that were expelled into interstellar space. The glowing gaseous shrouds in the nebula were shed by the central star after it ran out of fuel to sustain the nuclear reactions in its core. This Hubble image was taken in November 2008 with the Wide Field Planetary Camera 2. The colors in the image represent a range of emissions coming from the clouds of the nebula: red represents nitrogen, green represents hydrogen, and blue represents oxygen. (NASA, ESA, and the Hubble Heritage Team, STScI/AURA.

(see this on Google Sky)

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