The dust particles have exactly the same chemical composition as the gases of the interstellar medium.
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Q2: Dark dust clouds are cooler than their
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Q4: There is as much mass in the
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Q8: Light from distant stars that must pass
Q9: O and B type stars are usually
Q10: The 21 cm line of hydrogen is
Q10: Emission nebulae get their red color from
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Q17: The gas in the interstellar medium consists
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