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Vocabulary
| Big Bang | cosmic microwave background radiation | deuterium |
|---|---|---|
| recombination |
Review Questions
- What is the cosmic microwave background radiation a relic of?
- What is the type of spectrum of the background radiation? What is the temperature of the Universe now?
- What can the photons do when recombination occurs and why is that?
- About when did the Big Bang supposedly occur?
- What was the universe like for the first few million years after the Big Bang? How was the early universe like the cores of stars shining today?
- Where did most of the hydrogen and helium in the universe come from? How about the deuterium? Why did the early universe not continue the nucleosynthesis process to heavier nuclei?
- How does the present abundance of deuterium provide a good constraint on the early density of the universe?
- What is the evidence for a Big Bang type of model for the universe and for a universe that has evolved over time?