matter that we have identified from its gravitational effects but that we cannot see in anywavelength of light
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Which of the following best summarizes what we mean by dark matter?
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It is a name given to whatever is causing the expansion of the universe to accelerate withtime.
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Which of the following best summarizes what we mean by dark energy?
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dark matter represents much more mass and extends much further from the galactic centerthan the visible stars of the Milky Way
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The text states that luminous matter in the Milky Way seems to be much like the tip of an iceberg.This refers to the idea that ________.
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a graph showing how orbital velocity depends on distance from the center for a spiral galaxy
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What is a rotation curve?
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We construct its rotation curve by measuring Doppler shifts from gas clouds at differentdistances from the galaxy's center.
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What is the primary way in which we determine the mass distribution of a spiral galaxy?
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Gas clouds orbiting far from the galactic center have approximately the same orbital speed asgas clouds located further inward.
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What do we mean when we say that the rotation curve for a spiral galaxy is "flat"?
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Elliptical galaxies probably contain about the same proportion of their mass in the form ofdark matter as do spiral galaxies.
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Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what doescurrent evidence suggest?
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measuring the temperatures of stars in the halos of the galaxies
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Which of the following is not one of the three main strategies used to measure the mass of a galaxyclusters?
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It bends or distorts the light coming from galaxies located behind it.
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When we say that a cluster of galaxies is acting as a gravitational lens, what do we mean?
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Dark matter is the dominant form of mass in both clusters and in individual galaxies.
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Which of the following statements best summarizes current evidence concerning dark matter inindividual galaxies and in clusters of galaxies?
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It consists of atoms or ions with nuclei made from protons and neutrons.
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What is the distinguishing characteristic of what we call ordinary matter (such as the matter thatmakes up stars, planets, and people)?
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globular clusters in the halo of the galaxy
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Some dark matter may be ordinary matter that orbits in the halo of the galaxy. Which of thefollowing would not be considered a type of ordinary dark matter?
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They respond to the weak force but not to the electromagnetic force, which means they cannotemit light.
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What do we mean when we say that particles such as neutrinos or WIMPs are weakly interacting?
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