Emission nebula and H II Region ( A large cloud of gas and ionized gas of glowing low density in which star formation has recently taken place. Young, hot, blue stars—which have formed from the gas—emit copious amounts of ultraviolet light, ionizing and heating the gas surrounding them) in the constellation of Sagittarius.Is a giant interstellar cloud ,an accumulation of gas, plasma and dust. Distance from Earth 4000-6000 light years .
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