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Thought Questions
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1
M31, the great galaxy in Andromeda and a member of the Local Group of galaxies, is approaching us. Does this mean that the Hubble law is wrong? Why?
2
Suppose the Hubble constant were discovered to be five times larger than is now believed. How would that affect our estimate of the age of the Universe?
3
Does it bother you that the Universe may expand forever?
4
Why do most stars, including our own Sun, contain more helium than the 24% formed during the Big Bang?





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