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Calculating strength gravity over light years

  1. Feb 15, 2010 #1
    How do I calculate the strength of gravity between two objects say that 2 years ago were 2 light years apart, during which they became 0.5 light years closer, if during those two light years, the stars lost 50% mass due to fusion and light,

    based on their mass "now", or based on how much mass they had 2 years ago,
  2. jcsd
  3. Feb 16, 2010 #2
    That is a Relative question. Which do you want or need to know?
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