Quote:
Originally Posted by stevemc2  I wonder what would happen if one somehow lived on a planet a few meters from the edge of the universe, and then threw a baseball towards the edge of the universe, at a velocity faster than the expansion rate.
Would the baseball then:
a) bounce back
b) disappear
c) get stuck at the boundary
d) cross the boundary and cease to exist
e) none of the above |
Steve,
What is happening to the planet as the universe expands. Is it staying still or is it moving away with the same velocity as that of the expansion.
Anyway I don't know why it should cease to exist if it is swallowed by our universe. It can exist in our universe.
And I think it will not be retrievable by the guy on the planet if the gravity of our universe acts only within the confines of our universe.
It may get stuck you know if the gravity on the planet is same as that of the gravity of the universe then both will be contending who wants the ball.
It would bounce back if the gravity exerted by the planet is more than the gravity exerted by the universe on the ball.
Who knows that planet may just be another universe in that case we will have to make a universal system like the planetary system.
Good one though, for a thought experiment!!