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  • Planetary Nebula Survey

  • 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.

Planetary Nebula Survey


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B2 中上級

惑星状星雲調査 (Planetary Nebula Survey)

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    QAM Chen に公開 2021 年 01 月 14 日