Also, they say you can't travel at the speed of light, but I say that's bullshit if you cheat. Just find an object that's moving toward you at half the speed of light, and you travel toward that object at the other half of the speed of light.
Once you find the object traveling towards you at .5c
, you're already traveling towards it at .5c
The result is that you're traveling at .5c
, relative to that object - no speed limits broken.
You can travel faster than the local
speed of light if you go somewhere where light travels slower (like underwater - light travels at .75c
is just the speed at which light travels under ideal conditions (a perfect vacuum); actual light will go slower if there's matter and electric fields everywhere. See Cherenkov radiation
for what happens when you do.