So here's an interesting fact. At 0.9999999 % the speed of light, over a distance of 42 light years, it takes just over 42 years for someone watching you to see you land. But it takes you 4.8 hours to get there. You are offset in time by quite a large amount. Now, this is assuming you can accelerate instantaneously to that speed and just as instantaneously decelerate. But it demonstrates this thing called "Time Dilation". And I figured out that if you did go at the speed of light, time for you would literally stop. Zip, nada, zero. So you would be stuck forever at the speed of light, since any ship computers would also be going at the speed of light and would stop. In layman's terms: You're screwed. This could be used as time travel. Since time is entirely relative, you would only age 4.8 hours every 42 years at this speed. And this is exponential. The closer and closer you get to lightspeed the slower you age.