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Q & A: long-range gravity

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Most recent answer: 01/07/2017
Q:
(Asking on behalf of my 11 year old niece....because I didn't know when she asked ME!) GRAVITY: If there are ONLY two Neutrons, at opposite ends of the current (but STATIC) Universe (i.e. not expanding or contracting. And no other particles), will Gravity EVENTUALLY draw them together? Or would it be so weak at that range that there's absolutely no effect?
- Dr Hugh R Johnston (age 60)
L3 6LL
A:

The universe doesn't have "ends" but it does have places very far apart. So far as we can tell from the basic form of the laws of gravity and from the large-scale behavior of the universe, gravity does still work at the maximum distances we can see, over 10 billion light years.

Mike W.


(published on 01/07/2017)

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