Calculating strength gravity over light years

[ensabah6]

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,

 

[Frame Dragger]

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,

That is a Relative question. Which do you want or need to know?