Calculating strength gravity over light years

AI Thread Summary
To calculate the strength of gravity between two objects that were initially 2 light years apart and became 0.5 light years closer, one must consider their current mass after losing 50% due to fusion and light. The gravitational force can be calculated using Newton's law of gravitation, which requires the current mass and the distance between the objects. The discussion highlights the importance of determining whether to use the mass from two years ago or the current mass for accurate calculations. The choice between these two approaches depends on the specific context and requirements of the calculation. Understanding the implications of mass loss over time is crucial for accurate gravitational strength assessment.
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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,
 
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ensabah6 said:
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?
 

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