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AstroImaging by Kent Biggs
"Time - its what keeps everything from happening at once" -unknown
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An emission nebula is a glowing cloud of interstellar gas. The gas is emitting light of its own accord cause by some stimulus such as a nearby star exciting the gas. A reflection nebula is a cloud of dust and gas that reflects the light of nearby stars.
NGC 7129 ~ The Rosebud Nebula
NGC 2359 ~ Thor's Helmet
M16 ~ The Eagle Nebula
The Horsehead Nebula
The Crab Nebula, M1
Crab Nebula Exploding TimeLapse!
The Crescent Nebula - NGC 6888
M20, The Trifid Nebula
Bubble Nebula