Emission nebulae are created by gas absorbing ultraviolet energy from the hot young stars within them, such as in the Orion Nebula.
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Q4: There is as much mass in the
Q8: Light from distant stars that must pass
Q9: O and B type stars are usually
Q10: Emission nebulae get their red color from
Q11: We usually find dark molecular clouds beside
Q13: 21- cm radio waves are emitted by
Q14: Dark dust clouds are optically invisible, but
Q15: While ionized hydrogen glows bright red, neutral
Q16: The predominant color of emission nebulae is
Q17: Interstellar matter is distributed very evenly throughout
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