Physics, 06.08.2019 05:10, sayedabdullah

What two things are needed to create an emission nebula? a) interstellar gas and dust b) hydrogen fusion and helium ionization c) cool stars and much interstellar dust d) hot stars and interstellar gas, particularly hydrogen e) hydrogen gas and carbon dust

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What two things are needed to create an emission nebula? a) interstellar gas and dust b) hydrogen f...