Look how far we have come in the last hundred years, I believe in the next hundred, man will be visiting places like I have in this video, what takes us now several months to get to mars, will be done in a blink of an eye, with the new technology we will have in place by then, I believe at the turn of the 22 century man would have colonised mars and that a quarter if not more people from earth population will be living there, because we know by 2040 will will have ten billion people Living on the planet by then, and the earth will struggle to sustain that many people, for more than a few decades.