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Hi, mathematically in the F = GMm/r^2 equation r can be very close to infinity (or the size of the universe), but gravitational force always will be some number.

But how is that in the real world? Let's say we have a perfectly empty universe but only with two sun-like stars. If they are away from each other like 45 billion light years, then is their gravitational force still some number or 0?

I took a zero because I'm wondering if space has rubber-like physics. 2D rubber plane with x, y geometrical dimensions and z gravity. If its area is huge (like millions of kilometers ^2), then a small metal ball cannot deform this stretched elastic thing thousands of kilometers away, right? (or it can but it will approach zero?)

If you know what I mean...

Thanks.

But how is that in the real world? Let's say we have a perfectly empty universe but only with two sun-like stars. If they are away from each other like 45 billion light years, then is their gravitational force still some number or 0?

I took a zero because I'm wondering if space has rubber-like physics. 2D rubber plane with x, y geometrical dimensions and z gravity. If its area is huge (like millions of kilometers ^2), then a small metal ball cannot deform this stretched elastic thing thousands of kilometers away, right? (or it can but it will approach zero?)

If you know what I mean...

Thanks.