As far as Space, It doesn't end, it just keeps going. There is no end. There will be an end to civilization on Earth, but that is probably many years away. The Bible speaks on this subject, but there are many things that Man will never know.
Yeah, I've heard that either our sun will go first (explode, heat and what not) or there is a neighbour galaxy that is heading our way. On the documentary it looked real close to us, like inches but they said it was still thousands of years away lol. They said we would collide and the combined galaxies would spiral out, some planets will collide, others will explode and some may live through it. They said that even if earth does live through it and a new star (sun) is born earth would still need to be close to it to live as we do now, enough sun etc, slim chances. Earth will go, no question, it's simple fact. Question is will humans find that next planet to live on. It can be done and we have the time. But, we're a disease and will probably blow ourselves up by then over some land ownership and powers to be arguing over spilt milk..........
Thanks for the links TC, awesome stuff to ponder. This topic is very interesting, good to talk about over an open fire in the bush (forest) with a few mates, cold beers and a clear night.