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nebula star space astronomy universe galaxy constellation Serpens Eagle Nebula Messier 16 M16 NGC 6611 emission nebula ionized hydrogen oxygen sulfur pillars of creation cosmic celestial interstellar ethereal supernova remnant SNR open cluster NGC 6611 youthful star cluster hot young stars blue-white stars red giant stars infrared radiation stellar winds gas dust plasma magnetic fields gravitational forces cosmic microwave background radiation CMB Big Bang creation of the universe origin of the universe evolution of the universe fate of the universe black holes dark matter dark energy