Astronomy Questions Chap. 18-19
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1. How do we know the universe is expanding?
2.
What are the four physical forces that we see in nature?
3.
What is meant by a radiationi dominated universe? Matter dominated universe?
4.
Why does the existence of carbon based molecules in meteorites enhance the probability of life outside our planet?
5.
What does the Drake equation attempt to determine? |
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