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What is the relation

  1. Jul 1, 2011 #1
    hi every body

    i have a question what is the relation bet relativity and the expansion of the universe

    and how einstine formed his cosmological condtant
  2. jcsd
  3. Jul 1, 2011 #2
    The relationship is that general relativity predicts a universe has to be either expanding or contracting. Holding perfectly still is like balancing a pencil on it's point - a slight change and it tips.

    The cosmological constant was added by Einstein in hope of a static Universe solution - the constant would keep the Universe from expanding or contracting, but the balancing act is incredibly difficult.
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