Lect 20 - Question 9-1 Galaxies are distributed through the universe in A isolated clusters containing anywhere from a few dozen galaxies to

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Galaxies are distributed through the universe in A. isolated clusters containing anywhere from a few dozen galaxies to thousands of galaxies B. clusters, which are grouped into linked superclusters around huge voids (like soap sud) C. isolated superclusters, each of which contain dozens of clusters of galaxies D. a random scattering of small clusters of galaxies similar to the Local Group Question 9-1
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Whether a protogalaxy evolves into an spiral or elliptical galaxy depends on its A. temperature B. luminosity C. mass D. Initial rate of star formation Question 9-2
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Which of the following is true about the nature of quasars? A Quasar must be very small in size (like an individual star). B Quasars must be within the Local Group. C Quasars must be very luminous. D Quasars must be moving toward Earth with large radial velocities. Question 9-3
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Radio lobes radiate synchrotron radiation. This indicates that A the source of the radio energy is rotating rapidly. B high speed electrons are spiraling through a magnetic field. C the source of the radio jets must be a supernova. D the central galaxy must be a giant elliptical galaxy. Question 9-4
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Which of the following provides scientists with evidence that the energy source of quasars must be relatively small (compared to the size of a galaxy)? A Quasars have high radial velocities. B Quasars are very luminous. C Quasars are surrounded by quasar fuzz. D Quasars radiate huge amounts of energy. E Quasars’ brightness fluctuate rapidly. Question 9-5
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To what does the phrase “superluminal motion” refer? A. the motion of relativistic electrons in magnetic fields B. the apparent motion of jets of gas at speeds faster than light C. the apparent motion of arcs of light caused by gravitational lensing D. the motion of galaxies at redshifts z > 1 Question 9-6
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two parameters of galaxies? A
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This note was uploaded on 02/06/2011 for the course ASTR 113 taught by Professor Geller during the Spring '08 term at George Mason.

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Lect 20 - Question 9-1 Galaxies are distributed through the universe in A isolated clusters containing anywhere from a few dozen galaxies to

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