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Expansion of the universe Q: What is the Cosmological Principle? Why is it not an exact...

Expansion of the universe

Q: What is the Cosmological Principle? Why is it not an exact statement? In what sense could it be true (on large scales a good approximation)?

Q: What is Hubble’s Law? What does it say in simple terms? What is the pattern of galaxy motions relative to us? What are possible interpretations of this motion?

Q: What is the cosmic scale factor? What does it measure? What is its value today? in the past? the future?

Science   Advanced-Physics   
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