- 2,295
- Indiana
- pie4july
Impossible at the current stage of technology obviously, but not possible at any time in the next 5 billion years before the Sun leave the main sequence? I find that implausible.
Let's assume that you have to get there within a single human lifespan, so we're not talking about arkships that are essentially little worlds unto themselves.
Let's assume that sometime in the next 5 billion years technology develops to the point where energy is no longer a restriction, either through total conversion of matter to energy or some other means (solar powered lasers and a light sail?). So we can have a ship that accelerates halfway there and then decelerates the other half, minimising trip time.
https://en.wikipedia.org/wiki/Space_travel_using_constant_acceleration
While the time for an observer on Earth is pretty long for anywhere beyond Proxima Centauri, relativity means that the experienced time on board is much shorter. You can get to a lot of places in a single shipboard human lifetime.
Then it becomes about can you create a ship that can support humans for years. At the moment we can probably do it for a limited period of time, but a major obstacle is human psychology.
But let's also assume that in the next 5 billion years the understanding of human psychology advances to the point that we can have humans living in confined quarters for twenty years without going psychotic, and that the systems supporting them are sufficient to function safely for that period of time. If we've got an antimatter drive, we can make oxygen and food generators that self-repair. Or just take plants.
I don't think these assumptions are unwarranted given the periods of time we're talking about. Human technological history is what, maybe 100,000 years old if you count from fire and sharp rocks? Given where we are now, and how technological progress seems to be accelerating over the last few hundred years, I feel like given 50,000 times as long there's basically no problem that is absolutely unsolvable unless there are physical laws preventing it. And interstellar travel is totally possible within current physics without even getting into wacky faster-than-light drives or anything particularly controversial. Straight up acceleration with Einsteinian time dilation does the trick.
Bar a breakthrough it's not going to happen for thousands of years, but it will happen eventually if only purely from population pressure. Provided we don't kill ourselves, which is why I had the first part of the question.
This assumes of course that climate change does not wipe out humanity in the next few hundred years.