Chapter 17 Homework

Chapter 17 Homework - Chapter 17 Fill In the Blank 2....

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Chapter 17 Fill In the Blank 2. Homogeneous means "the same everywhere ." 3. Isotropic means "the same in all directions ." 4. Together, the assumptions of cosmic homogeneity and isotropy are known as the cosmological principle . 5. If the universe had an edge, this would violate the assumption of homogeneity . 6. If the universe had a center, this would violate the assumption of isotropy . 8. Luminous matter makes up at most _______ percent of the critical density. 9. The surface of a sphere is a two-dimensional example of a closed universe. 10. The present average temperature of the universe, as measured by the cosmic microwave background, is 3 K. 11. Comparing the mass density of radiation and matter, we find that, at the present time, matter dominates. 12. When the universe was a few minutes old, nuclear fusion produced normal matter and exotic matter . Review and Discussion 2. What is the cosmological principle? 3. What is Olbers’s paradox? How is it resolved? 5. Why isn’t it correct to say that the expansion of the universe involves galaxies flying outward into empty space? 6. Why are recent observations of distant supernovae so important to cosmology? 7. Where and when did the Big Bang occur?
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Chapter 17 Homework - Chapter 17 Fill In the Blank 2....

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