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11 Cards in this Set
- Front
- Back
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Which of the following are candidates for dark matter? |
faints stars WIMPS Jupiter-sized objects brown dwarfs |
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Why isn't space expanding within systems such as our solar system or the Milky Way? |
Their local gravity is strong enough to hold them together against the expansion of the universe |
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Overall, the objects in our visible universe formed mainly from smaller structures joining into larger structures, rather than one initial large structure breaking up into smaller ones. |
True |
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Gravitational lensing occurs when |
massive objects bend light beams that are passing nearby |
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Some MACHOs emit radiation. Why are they considered dark matter then? |
They are not as bright as normal stars and not visible over large distances |
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One possible ingredient of dark matter is known as WIMPs (weakly interacting massive particles). WIMPs are probably made of protons and neutrons. |
False |
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In the early universe, why were inhomogeneities in the distribution of normal matter much smaller than the inhomogeneities in the dark matter? |
Radiation pressure affected normal matter but not dark matter. |
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What process is most responsible for shaping the large-scale structure of the universe? |
Gravity |
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What does the large-scale structure of the universe look most like? |
A sponge with many large holes |
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Which of the following is FALSE? |
Most galaxies in the local group are large spiral galaxies. |
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We expect the galaxies that we see at a redshift of 4 will be __________ than galaxies today. |
smaller and bluer |
