Originally posted by Enemy Ace
The only one of those scenerios that could possibly happen in my lifetime is the nuclear war (and it is highly unlikely we'll fire a nuke at China, who btw is sporting a Japanese flag, for no reason whatsoever). All in all, I think we're pretty safe for another 1000 years, at least.
One thing I am almost completely certain of is that the human race will not outlive the expansion and death of Sol (our star/sun). There is no other place to go other than Mars, Venus, and the several moons with ample water (Europa, Jupiter comes to mind). The nearest star to our solar system is Proxima Centauri. It is 4.3 lightyears away, which means, traveling at the speed of light it would still take 4.3 years to get there. Light travels at 186,282 miles per second. Matter cannot travel at the speed of light, because as matter travels faster it gets heavier. So, unless you can figure out a way to turn matter into pure light energy, transport it for more than four years to Prox-Cent and revert it back to its former state (no way in hell), then we must assume travel will take place at a fraction of that 186,282 miles per second. Orbiting space craft travel at approximately 17,000 miles per hour. Let us further assume you use Earth's gravity to slingshot a space craft carrying several thousand or tens of thousands of people with supplies and equipment toward the Prox-Cent. I'm gonna go ridiculous, here, and give us 50,000 miles per hour (no way in hell) or more than 16 miles per second. 16 mps Vs. 186,282 mps? That is appx. 0.0086%. It will take 11627 times longer to get to Prox-Cent. That is more than 46,000 years. Assume that we can make even 1/10th the speed of light (which maybe you can get slingshotting around the Sun) So we go through all of this, travel for fourty years, get to Prox-Cent.......are we gonna find a decent planet to live on?! Are they all gas giants? Are they hotter than hell, like Mercury? What is the possibility of finding another Earth? Think about it. We can only hope for a Mars-like planet. If there is no suitable planet, turn back?! That is double the supplies and fuel needed...if not, die? There are other star systems near that. So you move on further away from Earth. Another 1 - 4 more light years or 10 - 40 years. Still there is a high chance there will be no suitable planet to settle. But hell, getting there is the real challenge. I just don't see it happening.