#2217 - Brian Cox

9509.08 - 9534.891 Brian Cox

We could, in principle, explore the galaxy and beyond. But getting to chat to everybody about what you found is forbidden by the structure of the universe. It's the way that relativity works. That really is essentially a time machine. Well, it's a time machine in the sense that we could go arbitrarily far into the future. by flying around in a rocket very close to the speed of light.