Out of all controversial debates, this would most likely be my one of my favorites. Here is my stance on what is "Beyond Space".
Imagine that space was finite (has a boundary where it stops). Now imagine that you are standing at the outer boundary, and threw a ball in its direction. If it goes right through the boundary, proving that there is space beyond the boundary....or it stop and bounces off the boundary, that means that there is something behind the boundary stopping the ball from going through. But if it stopped then there still mean that there is something in space behind the boundary. Either way you look at it there is no possible way for there to be a boundary.
BUT, if you say that space is infinite then you would probably also say that it is very plausible that there would be an infinite number of stars in the sky. Either that or they are all around here...but why would all of the stars in the infinite universe be around here? So...if there was an infinite number of stars, would it not be bright outside at night?
Our planet's pollution is steadily increasing, the ozone layer is getting fucked over, Global Warming is threatening us and we're running out of natural energy resources. If we found a bigger planet with a much healthier environment we could secure the survival of our specie for another few thousand years, then perhaps find a new hospitable planet, repeat the cycle, etc. Basically, what we can possibly find in a different galaxy could mean everything for mankind. It'd take us a while to adapt, but we'd get there eventually.
Its a natural cycle for the Earth to heat up and cool down. I was watching the National Geographic Channel one day and narrator said "Species die every day, but new species are being created every day, the Earth does not need saving, it goes through a cycle of heating and cooling, completely reseting O-zone levels."
Also, I might add if anything will kill the human race, and every kind of animal or plant is the Earth's core. It has been studied and it is appearing to be slowing down, which in return would destroy our sort of magnetic barrier that protects us from the Sun's extremely harmful particles. Its why Mars is uninhabitable right now, I has no atmosphere, or magnetic force to repel the particles.