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Hubble image of the Ring Nebula, a planetary nebula in the constellation Lyra
NASA and The Hubble Heritage Team (STScI / AURA)
  Image 3-12
Ring Nebula in Lyra

The colorful Ring Nebula is one of the most famous planetary nebulae. It is a giant shell of gas surrounding a central star. Planetary nebulae get their name from their circular shape, which sometimes resembles a planet.

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