If every action has its equal and opposite reaction, then why is the universe expanding? It is exerting force and expanding but an equal force should be acting on it to make contract. So it should not be expanding, isn't it?
337Relativity explains this. The best answer according to me would be that the space time curvature (~higgs field) is not absolutely plane. Its something like a cone with height infinity. At the top of the cone (at the infinite point), is the white hole, i.e. the big bang. All the heavenly bodies are slowly sliding down the cone. This pic I have made may explain it better:
Hope it helps...
Thanx...
150The space outside the universe is not defined. We don't know if there is anything beyond the universe that would be applying the force.
The universe should be slowing down its expansion but studies show that the expansion is actually speeding up because of dark matter so its possible that the universe will expand forever.
111)the universe has been expanding from an initial singularity....essentially the big bang. And as space is devoid of any air,no opposing force is produced against these heavenly bodies. you will get the rest of the answers in the book "A BRIEF HISTORY OF TIME" by Stephen HAwking.
