Interstellar Medium
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Nebulae
Fusion - Physics of a Fundamental Energy Source Nebulae Fuzzy Patches in Space Photo Credit: NGC 2440, Hubble Space Telescope The term nebula was originally used by astronomers to refer to any fuzzy' patch in the sky that could be easily distinguished by a telescope, but was not sharp like stars or planets. Charles Messier, an eighteenth century French astronomer, published his famous catalogue ...
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Stellar Phenomena@