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Planetary Nebulas, Composite

Planetary Nebulas, Composite

C029/5557

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Credit

NASA / CXC / RIT / STSCI / SCIENCE PHOTO LIBRARY NASA / CXC / RIT / STSCI / SCIENCE PHOTO LIBRARY

Caption

This gallery shows four planetary nebulas from the first systematic survey of such objects in the solar neighbourhood made with NASA's Chandra X-ray Observatory. The planetary nebulas included here are NGC 6543, NGC 7662, NGC 7009 and NGC 6826. X-ray emission from Chandra is colored purple and optical emission from the Hubble Space Telescope is colored red, green and blue. A planetary nebula is a phase of stellar evolution that the sun should experience several billion years from now, when it expands to become a red giant and then sheds most of its outer layers, leaving behind a hot core that contracts to form a dense white dwarf star. A wind from the hot core rams into the ejected atmosphere, creating the shell-like filamentary structures seen with optical telescopes. The diffuse X-ray emission is caused by shock waves as the wind collides with the ejected atmosphere. The properties of the X-ray point sources in the center of about half of the.

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