The compositions of dark clouds can be determined through absorption spectra.
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Q13: Most molecules found in the giant molecular
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Q15: Emission nebulae appear red because they are
Q16: The H I regions are mapped by
Q17: The gas in the interstellar medium consists
Q19: Emission nebulae are blue.
Q20: A dark cloud can be detected if
Q21: Interstellar gas is composed of:
A)only hydrogen.
B)90% hydrogen,
Q22: Due to absorption of shorter wavelengths by
Q23: Molecular hydrogen can best be detected by
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