Emission nebula: NGC also called the Bubble Nebula, Sharpless or Caldwell in the constellation Cassiopeia. Blown by the wind from a massive star, this interstellar apparition has a surprisingly familiar shape.
A unique peanut-shaped cocoon of dust, called a reflection nebula, surrounds a cluster of young, hot stars in this view from the NASA/ESA Hubble Space Telescope. The 'double bubble' called is inside a larger nebula named DEM L
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