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Recent Podcast
A Tour of Eta Carinae
A Tour of Eta Carinae
New Chandra data are helping astronomers better understand how the two stars in Eta Carinae interact with one another through powerful winds blowing off their surfaces. (2014-08-27)


Planetary Nebula Survey

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Narrator (April Hobart, CXC): 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. It will then shed 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 will ram into the ejected atmosphere, creating beautiful, shell-like structures seen with optical telescopes. This gallery shows four planetary nebulas from the first systematic survey of such objects in the solar neighborhood made with NASA's Chandra X-ray Observatory. X-ray emission from Chandra is colored purple and optical emission from the Hubble Space Telescope is colored red, green and blue. The diffuse X-ray emission is caused by shock waves as the wind collides with the ejected atmosphere.

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