Originally Posted by ZONA
Nope. It's like a fat person who can lose 100 pounds easy but when somebody in shape wants to lose that last 10 pounds it's a MF'er. hahaha
Seriously though, who knows what will happen. The 2 main things we need to master, IMO, are fusion and magnetic fields. Fusion for the energy to propel you through space at light speed and the magnetic fields to protect you from radiation and micro asteroids. You've got to be able to generate pseudo gravity, atmospheric pressure, water generation, food supply. And you've got roughly a few million years to get it done because our Sun will most likely be going into Red Giant phase by then.
I love this crap man, one of my favorite past times. We should have a sticky all offseason long with fun discussions on this topic.
This may sound defeatist, but we as a species have nothing to fear from the sun. By the time the sun kills off all life on earth we will either have moved elsewhere or destroyed every opportunity of ever going anywhere ourselves. We have all the resources we need.
Fusion would definitely be a good power source. Magnetic fields are not the only option for radiation protection, electronically charged shielding may be a lot better. Fake gravity can be done by making a rotating vessel, protection against debris, you are probably going to have to go low-tech with a Titanic like solution, compartmentalize and accept that if there is an impact you may take casualties, so make sure you have very high redundancy. Water generation is trickier, you would need to bring a lot of water from the outset and you would need to recycle like crazy, so you would need to purify urine and bathing would be a thing of the past. Food is a bit easier, it is much more compactable than water and diets that are very high nutrients can be devised.
I think the best option of going far (out of solar system) would be to create either flotillas of smaller ships or a few bigger ships so groups of 50.000 to 100.000 can go together, that would leave room for redundancy and provide enough genetic variance to avoid inbreeding problems among descendants.