Chapter 15 (Cosmology in the 21st Century) Quiz

Chapter 15 (Cosmology in the 21st Century) Quiz - Astronomy...

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Astronomy 101: Chapter 15: Cosmology in the 21 st Century 1. What assumptions are made in Olbers' paradox? a. The universe is finite. b. The universe is infinite. c. The universe is uniformly filled with stars. d. Both a and c above. e. Both b and c above. 2. What cosmological inference can you draw from the observed darkness of the night sky? a. The universe is infinite. b. The sun is below the horizon. c. Earth's atmosphere scatters light. d. The universe is not infinitely old. e. The apparent magnitude of bright galaxies is less than that of bright stars. 3. If the universe has no edge, then it must also have no: a. age. b. mass. c. center. d. temperature. e. all of the above. 4. What is meant by the term "observable universe"? a. It is everything that exists. b. It is the part of everything that exists that we can see. c. It is the part of everything that exists that is above the horizon at one instant. d. It is the part of everything that exists that is within our galaxy. e. It is the part of everything that exists that is within the solar system. 5. What evidence do we have that the universe is expanding? a. Earth is gaining mass and volume as it collects about 40,000 tons of meteoric dust each year. b. As the sun ages, its surface temperature decreases and its diameter increases. c. As stars age, some become giants and supergiants. d. The amount of red shift in the spectra of distant galaxies is proportional to their distance. e. All of the above. 1
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6. If the Hubble constant is 71 km/s/Mpc to the first approximation, how old is the universe?
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Chapter 15 (Cosmology in the 21st Century) Quiz - Astronomy...

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