Quote:
Originally Posted by Mohan.C  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!! |
Mohan C.,
thanks for reply, but to eliminate all these other forces, assume the planet is expanding at the same rate of the universe and the ball is thrown fast enough to overcome the planet's g force so that it meets the edge of the universe.
Maybe substitute shining a laser pointer at the edge, where do the photons go at the edge?