(a) The evidence that proves the presence of the interstellar gases.

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Chapter 18, Problem 4Q

To determine

(a)

The evidence that proves the presence of the interstellar gases.

To determine

(b)

The evidence that proves that there is dust in the interstellar medium.

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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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