We observe molecular hydrogen gas (H2)using 21-cm emission.
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Q4: The lowest-density gas in the interstellar medium
Q5: The average density of the interstellar medium
Q7: Our galaxy is classified as an Sd
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Q12: Open clusters are only found in the
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Q18: The dust in the interstellar medium comes
Q18: Halo stars formed before gas in the
Q19: The only effect of interstellar dust is
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