Gravity at a Distance
Most recent answer: 09/03/2016
- Wayne (age 24)
The universe doesn't really have "ends", but to the best of our knowledge two atoms ot near opposite parts of our cosmic horizon do still attract each other via gravity. They won't ever come together, however, because the expansion of the universe is accelerating so they will be outside each other's horizon. The sort of change that would be required to make the acceleration stop (some phase change of the vacuum) would not leave those atoms existing in anything like their present form.
As far as communication goes, gravitational changes travel at the speed of light, the same as electromagnetic changes.
(published on 09/03/2016)