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     As the title suggests, a supernova remnant is the remains of a supernova, a stellar explosion. An event caused by one of two ways, either a massive star's core suddenly collapses after running out of enough fuel to generate fusion energy, or when a white dwarf star accumulates too much matter from a star it's in orbit with, becoming unstable and exploding. What are left after these spectacular phenomena are supernova remnants, highly luminous structures expanding their stellar guts at as much as ten percent the speed of light, replenishing the interstellar medium and carrying with them elements such...

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A dark nebula is a dense interstellar cloud of molecular gas and dust particles that block all visible light from background stars and various cosmic objects, most notably in bright emission nebulae. Dark nebulae are extremely cold as with some such as 'Barnard 68', a dark nebula in the constellation Ophiuchus, is at an estimated -257 degrees celsius. Because of the molecular composition and sheer density of these clouds, star formation is common.  

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Unlike the ionization of atoms that occur in emission nebulae, a reflection nebula is a cloud of interstellar dust that gets its glow from light reflecting off of a nearby star.  

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An emission nebula is a luminous cloud of interstellar gas due to the ionization of its atoms through ultraviolet radiation. Among locations in which emission nebulae are found, H II regions and planetary nebulae are the most prominent. H II being an area in which a recent star formation has taken place emitting UV light that ionizes the gas that surrounds it, and the latter being a dying star that has ejected its outer layers with it’s exposed core ionizing them.

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Planetary nebulae are the ejected diffuse gas given off by a low mass star at the end of its life. In the red giant phase these stars will begin to expand, burning through their remaining fuel and eventually collapsing dispersing a large shell of gas.     The name 'Planetary Nebula' is a misnomer coined by british astronomer, William Herschel. After discovering Uranus, Herschel believed these objects had resembled the newly found gas giant and labeled them accordingly.     The first planetary Nebula to be discovered, The Dumbbell Nebula, was done so by french astronomer, Charles Messier, listing it in his catalog...

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