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| Stars orbiting in the________near the galaxy's center can have highly inclined orbits. |
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| Multiple supernovae occurring together can cause a ______________. |
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| Most dust grains form in the winds of ________________stars. |
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| A wave of pressure that moves faster than the speed of sound is called a ____________. |
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| Atomic hydrogen is detected by virtue of its emission of a radio wavelength of ___________________. |
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| What is the galactic fountain model? |
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Definition
| E. the theory that hot, ionized gas blown out of the galactic disk and into the halo by superbubbles cools down and falls back into the disk |
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| What evidence supports the theory that there is a black hole at the center of our galaxy? |
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| E. The motions of the gas and stars at the center indicate that it contains a million solar masses within a region only about 1 parsec across. |
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| All the following types of objects are found almost exclusively in the disk (rather than halo) of the Milky Way EXCEPT ______. |
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| Why are we unlikely to find Earth-like planets around halo stars in the Galaxy? |
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| A. Halo stars formed in an environment where there were few heavy elements to create rocky planets. |
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| The image of our galaxy in radio emission from CO, mapping the distribution of molecular clouds, is closest to the image of our galaxy in |
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| E. infrared emission from interstellar dust grains. |
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