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Question

Choose the best answer to each of the following. Explain your reasoning with one or more complete sentences.
Which part of the galaxy has gas with the hottest average temperature?
(a) the disk
(b) the halo
(c) the bulge

Solution

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Answered 2 years ago
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The halo of the galaxy hosts small hot stars and on average, it has the highest temperature. The disk has some hot stars too but there are many cloud forming regions where temperatures are very low and molecules form.

The bulge has some old stars that were there long enough to come closer and this is why some appear red. However, they are not hot stars and therefore the correct answer is b).

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