Molecular hydrogen atoms are found only inside dense clouds where they are shielded from stellar radiation.
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Q5: The average density of the interstellar medium
Q6: Star formation in a molecular cloud can
Q7: The H- atom is important in protostars
Q8: The interstellar medium is divided up into
Q9: The dust in the interstellar medium comes
Q11: When radiation from an object passes through
Q12: Stars forming in molecular clouds tend to
Q13: When winds blow the gas away from
Q14: Electronic transitions from the H2 molecule are
Q15: We observe neutral hydrogen gas using 21-cm
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