Planetary Nebulas, Composite

Planetary Nebulas, Composite

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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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Keywords: 2012, 21st century, astronomical, astronomical object, astronomy, blue snowball nebula, caldwell 15, cat'ss eye nebula, celestial body, celestial object, composite image, deep sky, deep space, emission nebula, heavenly body, interstellar cloud, nebula, nebulae, ngc 6543, ngc 6826, ngc 7009, ngc 7662, planetary nebula, saturn nebula, science, snowball nebula, star-forming region, stellar-remnant nebula

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