1 A) superclusters B) variable galaxies C) super galaxies D) solar systems 2 A) distance from the Milky Way B) shapes C) luminosity D) pulsating variable stars 3 A) the inward force of gravity B) the momentum of the galaxies C) the outward force of gravity D) the critical density of the universe 4 A) It was slowing down, but now it is speeding up. B) It has always been slowing down. C) It was speeding up, but now it is slowing down. D) It has always been speeding up. 5 A) range from dwarf ovals, having masses of ten Suns, to giant spirals, having masses of 1000 Suns B) range from dwarf spirals, having masses of 100 Suns, to giant ovals, having masses of 100 million Suns C) range from dwarf spirals, having masses of 100,000 Suns, to giant spirals, having masses of 100 billion Suns D) range from dwarf ellipticals, having masses of one million Suns, to giant ellipticals, having masses of 100 trillion Suns 6 A) pulsating B) visible C) spinning D) invisible 7 A) classified as a white dwarf B) located in the arms of the galaxy C) older than 15 million years D) located in the nuclear bulge of the galaxy 8 A) active galactic nuclei B) dwarf ellipticals C) globular clusters D) black holes 9 A) variable stars B) the steady-state theory C) the Hubble constant D) the Milky Way 10 A) gamma rays B) a supermassive black hole C) a supernova D) gas clouds 11 A) sphere B) straight line C) oval D) disk 12 A) The universe was not expanding until recently. B) The universe expanded for a while and then stopped recently. C) The universe was bigger and less dense at some point in the past. D) The universe was smaller and denser at some point in the past. 13 A) central bulge B) black holes C) halo D) spiral arms 14 A) quasars B) radio galaxies C) the inflationary universe model D) The universe is expanding. 15 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078746361/561701/183_galaxy_ca_310c.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (19.0K)</a>]]>
A) A B) B C) C D) D 16 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078746361/561701/183_galaxy_ca_310c.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (19.0K)</a>]]> A) A B) B C) C D) D 17 A) gain in mass B) expansion and contraction of their outer layers C) constant contraction D) movement at a fixed rate 18 A) the evolution of the universe B) the origin of the universe C) the nature of the universe D) all of the above 19 A) many planets larger than Earth B) a great amount of unseen, or dark, matter C) billions of enormous black holes D) many elements unknown to us 20 A) gravitation B) relativity C) Big Bang D) Steady State
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