1 A) the Spiral Group B) the Virgo Group C) the Local Group D) the Super Group 2 A) black holes B) halo and central bulge C) spiral arms D) central bulge only 3 A) visible light B) infrared rays C) radio waves D) gamma rays 4 A) the same number that you can see with your eyes on a clear night B) 1 million C) 100,000 D) 100 billion 5 A) gain in mass B) expansion and contraction of their outer layers C) constant contraction D) movement at a fixed rate 6 A) their shape B) their age of formation C) their intensity D) their distance from Earth 7 A) active galactic nuclei B) superclusters C) radio galaxies D) spiral galaxies 8 A) the Andromeda Galaxy B) the Virgo C) the Sagittarius Galaxy D) the Local Group 9 A) spiral B) elliptical C) spherical D) irregular 10 A) dwarf ellipticals, giant ellipticals B) dwarf spirals, giant ellipticals C) dwarf ellipticals, giant spirals D) irregular, ellipticals 11 A) the evolution of the universe B) the origin of the universe C) the nature of the universe D) all of the above 12 A) galaxy, solar system, universe, planet B) solar system, galaxy, planet, universe C) planet, solar system, galaxy, universe D) universe, galaxy, solar system, planet 13 A) nothing B) other planets C) a cloud of dust and gas D) a supernova star 14 A) young stars B) old red stars C) remnants of supernovas D) dust and gas 15 A) 24,000 years B) 240,000 years C) 24 million years D) 240 Million years 16 A) shifted toward the red end of the spectrum B) shifted toward the blue end of the spectrum C) always ultraviolet D) always infrared 17 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 18 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 19 A) slowing down B) settling into a constant rate C) acceleration D) reversing 20 A) Galileo Galilei B) Albert Einstein C) Edwin Hubble D) Stephen Hawking 21 A) the Big Bang theory B) the Steady State theory C) the general theory of relativity D) all of the above 22 A) blue-shift B) red-shift C) green-shift D) violet-shift
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