The reason for late discovery of giant molecular clouds though they are among the largest objects in thegalaxy.

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Chapter 18, Problem 36Q

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The reason for late discovery of giant molecular clouds though they are among the largest objects in thegalaxy.

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(a) Rank the following components of the interstellar medium in order of the wavelengths at which they are observed, longest wavelength first: clouds of neutral hydrogen, coronal gas, interstellar dust, nebulae. Longest to Shortest? (b) Rank the same material in order of decreasing temperature from hottest to coolest. Hottest to Coolest?

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