Hubble Space Telescope image of the planetary nebula BD+30 3639 11/09/2000
The Hubble Space Telescope Image of BD+30 3639 shows a ring of gas at 30,000 degrees Celsius. This ring was ejected by a dying red giant star, and is now heated by ultraviolet radiation from the central star.
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Image Credit: NASA/J.Harrington et al.  
The Hubble Space Telescope Image of BD+30 3639 shows a ring of gas at 30,000 degrees Celsius. This ring was ejected by a dying red giant star, and is now heated by ultraviolet radiation from the central star. Scale: Image is 6.6 arcsec on a side. (1 arcsec = 230 billion kilometers at a distance of 5000 light years.)  
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