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The Essential Cosmic Perspective Study Set 1

Physics & Astronomy

Quiz 18 :

Dark Matter, Dark Energy, and the Fate of the Universe

Quiz 18 :

Dark Matter, Dark Energy, and the Fate of the Universe

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Based on current evidence, a supercluster is most likely to have formed in regions of space where .
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D

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Based on the observed amount of deuterium in the universe, we can conclude that
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A

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Refer to this scenario for the following questions: A multi- dimensional being reaches down to Earth and pulls you out of the universe. You are then thrown back into the universe at a place and time of the being's choosing, and you are permitted to leave only after you have identified your surroundings. This process is repeated several times. Through a scientifically unexplainable miracle, you are able to survive in every one of the places that you find yourself. In each scenario below, identify your surroundings (and potentially your cosmic era)from among the choices given. -It is bright everywhere. You have been able to travel around, and it's clear that you are not inside a star. Yet your surroundings seem as bright as looking directly at the Sun. As you travel around, you notice that you cannot find a single neutral atom anywhere, nor can you find any nucleus besides those of hydrogen and helium. While it is hot (a few thousand degrees Kelvin), it is nowhere near the temperature needed for nuclear fusion. Where are you?
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C

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What evidence suggests that the Milky Way contains dark matter?
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Which of the following best describes how galaxies are distributed on large scales in the universe?
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Which of the following statements best summarizes current evidence concerning dark matter in individual galaxies and in clusters of galaxies?
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The flat rotation curves of spiral galaxies tell us that they contain a lot of dark matter. Do they tell us anything about where the dark matter is located within the galaxy?
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When we measure the broadening of absorption lines in the spectrum of an elliptical galaxy, we can infer
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Refer to this scenario for the following questions: A multi- dimensional being reaches down to Earth and pulls you out of the universe. You are then thrown back into the universe at a place and time of the being's choosing, and you are permitted to leave only after you have identified your surroundings. This process is repeated several times. Through a scientifically unexplainable miracle, you are able to survive in every one of the places that you find yourself. In each scenario below, identify your surroundings (and potentially your cosmic era)from among the choices given. -You are in a hot, dense place. You are surrounded by nuclear reactions that are rapidly fusing hydrogen into helium. You notice that your surroundings are cooling and rapidly dropping in density. Within about 5 minutes, the fusion reactions stop. Where are you?
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The more baryons there are in the universe (a higher density of baryonic matter), the lower the ratio of deuterium to hydrogen is. Therefore, if Harry measures a higher ratio of deuterium to hydrogen than Sally, Harry infers
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The distribution of the dark matter in a spiral galaxy is
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Refer to this scenario for the following questions: A multi- dimensional being reaches down to Earth and pulls you out of the universe. You are then thrown back into the universe at a place and time of the being's choosing, and you are permitted to leave only after you have identified your surroundings. This process is repeated several times. Through a scientifically unexplainable miracle, you are able to survive in every one of the places that you find yourself. In each scenario below, identify your surroundings (and potentially your cosmic era)from among the choices given. -A moment before, you were enveloped in a bright plasma. You could not see very far as free electrons zipped around your head, scattering photons. But now, the universe has suddenly become transparent and you can see clearly. There seem to be no planets or stars, only a gas filled with mostly neutral hydrogen atoms. Where are you?
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The gravitational lens effect has been verified by
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The idea of inflation makes one clear prediction that, until the discovery of an accelerating expansion, seemed to contradict the available observations. What is this prediction?
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Which of the following would not be considered evidence for dark matter in clusters of galaxies?
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Why do we expect WIMPs to be distributed throughout galactic halos, rather than settled into the galaxy's disk?
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img This figure shows the X- ray emission from hot gas in two colliding galaxy clusters (red)and the distribution of mass (blue). Which of these are reasonable conclusions that can be drawn from this image? I.The mass found by gravitational lensing in these colliding galaxy clusters is in a separate physical location from the hot gas that resulted from the collision. II.Dark matter does not physically interact with regular matter, other than through gravity. III.Hot intracluster gas makes up the majority of the mass of galactic clusters.
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Which model of the universe gives the youngest age for its present size and expansion rate?
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Which statement correctly describes the role of dark matter in galaxy formation?
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Compared to the critical density of matter, about how much matter and dark energy is there?
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