Interstellar matter is distributed very evenly throughout the galaxy.
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Q1: Molecular clouds are much warmer than typical
Q6: Dark nebulae are opaque to all wavelengths
Q12: Emission nebulae are created by gas absorbing
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
Q20: Most molecules found in the interstellar medium
Q21: Interstellar gas is composed mainly of
A) only
Q22: Some regions along the plane of the
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