The reason for image of the sky at the range of radiowaves in Figure (b) and the image of the sky at the range of radiowaves in Figure (d) to reveal the presence of cool gas in the Milky Way and whether one could infer the presence of this gas from the visible-light image in Figure (a).

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Chapter 6, Problem 43Q

To determine

The reason for image of the sky at the range of radiowaves in Figure (b) and the image of the sky at the range of radiowaves in Figure (d) to reveal the presence of cool gas in the Milky Way and whether one could infer the presence of this gas from the visible-light image in Figure (a).

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