>Even at the speed of light, it would still take 4 years to travel to the nearest star system (Alpha Centauri). You can’t just yell “Hyperspeed, Chewie!” and travel through large distances instantaneously, because it’s just not possible.

Are you concerned with the lifespan of the travelers?

Because IF you could travel at nearly the speed of light (assume instantaneous acceleration), you would not experience the same passage of time while covering vast distances that an outside observer of your travels would.

For example, if you travelled a distance of 4 light years at 0.99999c, 4 years would pass for an outside observer, while you would experience about 3 weeks. At 0.999999c, the trip would take you 2 days. At 0.9999999c, 16 hours. At this last speed, you could travel from the Sun to the center of the Milky Way in under 12 years, during which 1000 generations would pass on Earth.

A fundamental problem of ludicrous speed travel is that the travellers can't stay "synchronized" with the civilization they are a part of.