Monday, November 24, 2008

M57 Ring Nebula in Lyra

The Planetary Nebula M57 is estimated to have exploded 20 000 years ago. The white dwarf in the middle (Magnitude 14) is surrounded by a darker space which is hotter than the visual ring. Since it so hot it does not emmit visual light but ultravioliet radiation. 23oo LY away.

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