Ast Ch 07 Ques
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This chapter discusses cosmological models of the universe including the Big Bang theory and competing theories. The Big Bang theory proposes that the universe began as a hot, dense point and has been expanding ever since. It is supported by observations such as the recession of galaxies and cosmic background radiation. The chapter compares open and closed universe models and discusses concepts like dark energy and the steady state theory.
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Ast Ch 07 Ques
- 1. Astronomy: A Self-Teaching Guide Ch. 07: The Universe 1. Define: Cosmology 2. What are two basic models of the universe? 3. When we look into space we see galaxies receding from us. What does this observation imply about the universe? 4. In the Hubble diagram (right), the ____________________ a galaxy’s distance, the ____________________ is its velocity of recession. 5. Describe the Big Bang theory. 6. Compare the open and closed universe concepts. Open Universe Closed Universe 7. Match the letters in the open universe diagram to the following description: _____ Big Bang explosion took place _____ Galaxies are still receding _____ Galaxies formed _____ Original hydrogen used up, the resulting cold, black universe will continue expanding indefinitely
- 2. 8. Match the letters in the open universe diagram to the following description: _____ Big Bang occurred _____ Galaxies formed and continued to recede _____ Galaxies will stop _____ Matter will be crunched together again (Big Crunch) _____ The universe will contract; galaxies will fall back inward _____ We live in an expanding universe; galaxies are racing away from one another today 9. What is the oscillating universe? 10. What is the mysterious dark energy? 11. Describe the steady state theory. 12. Why does the observation of galactic evolution support the Big Bang theory? 13. The ____________________ known stars consist of mainly ____________________ and helium and lack heavier elements. Newer stars contain heavy elements recycled from older generations of ____________________ that died and ejected their contents into space during ____________________ explosions 14. What is the significance of the cosmic background radiation?
- 3. 15. In general, how does the abundance of hydrogen and helium in stars support the Big Bang theory? 16. What is the age of the universe that was obtained by observation of the cosmic background radiation? 17. What is Olber’s paradox?