[DannyTN]

Ok, but how fast can we reasonably travel? How long would it take us to go 90 lightyears?

[Monty22]

90 lightyears? With current technology?

Millions of years. We might be able to get what, 250k miles per hour with nuclear propultion? Even that would take a very long time.

[JoeSchem]

Ok, but how fast can we reasonably travel? How long would it take us to go 90 lightyears?

With current technology -- warp drives need not apply -- we could build a giant rocket that is propelled by hydrogen bomb detonations behind a pusher plate. This concept was actually researched by the government in the 1950s and 60s and showed promised for interstellar flight (though it couldn't be operated within a million miles of Earth, and we've yet to travel a million miles from Earth, so it still isn't practical . . . but it is possible).

Anyhow, maximum speed for nuclear pulse was three percent light speed. Thus it would take three thousand years to travel ninety light years.

A multi-generational city-sized space ark would be appropriate.