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2) Will the Universe expand forever?
Now expanding- either expand forever or contract.
Contraction- due to gravity.
Matter in universe attract every other matter (gravitational forces) - opposes expansion tendencies.
Expect not to expand as rapidly as before after ‘Big Bang’
Theories to help test: some predict forever expansion, some include eventual contraction.
all predict definite relationship between galaxy clusters distance from us and the velocities of recession.
Majority of galaxy clusters- directly proportional.
Except ones 5 billion years away- Similar to model of Hubble’s Law predict accurate distance.