A planetary nebula results when a star like the sun becomes a red giant and sheds its outer layers.This gallery of four planetary nebulas shows Chandra X-ray data in purple and optical Hubble Space Telescope data in red, green and blue.The diffuse X-ray emission seen with Chandra is caused by shock waves as a wind from the hot remnant of the star collides with the ejected atmosphere.The four planetary nebulas are all located less than 5000 light years from Earth. [Read more] | image: Chandra X-ray/NASA

A planetary nebula results when a star like the sun becomes a red giant and sheds its outer layers.

This gallery of four planetary nebulas shows Chandra X-ray data in purple and optical Hubble Space Telescope data in red, green and blue.

The diffuse X-ray emission seen with Chandra is caused by shock waves as a wind from the hot remnant of the star collides with the ejected atmosphere.

The four planetary nebulas are all located less than 5000 light years from Earth. [Read more] | image: Chandra X-ray/NASA

Astronomy Chandra Hubble science space stars NASA

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    A planetary nebula results when a star like the sun becomes a red giant and sheds its outer layers. This gallery of four...