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Nebula

A Nebula is a large gas and dust cloud.  The gases are mainly Hydrogen & Helium.  Some Nebula are remnants of a past supernova (where a star explodes).  Others are gases given off by the star they surround.  Other Nebula are left over gases & dust from the "Big Bang" which took place about 15 billion years ago.  The ultraviolet energy given off by the center star  or nearby star causes the gases to glow similar to a neon sign.

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* means this is an old image that has not been recaptured with better equipment.

M1 RGB The Crab Nebula	M8 (Ha) Lagoon Nebula	M16 Eagle Nebula	M17 Swan Nebula
M27 LRGB Dumbbell Nebula	M42 Ha/RGB Orion Nebula (Color)	M57 RGB Ring Nebula (Color)
M76 RGB Little Dumbbell Nebula		NGC 2392 Eskimo Nebula	NGC6888
NGC 6888 (Ha) Crescent Nebula	NGC7000 (Ha) North American Nebula	NGC 7000 RGB image	IC 5070 Ha
IC 434-NGC2024 Horse Head & Flame	IC 5146	IC434-NGC 2024 Ha	IC 434 Horse Head
NGC 2264 Cone Nebula	NGC 7635 Bubble Nebula	NGC 7662 Blue Snowball