why is faster than light travel impossible?

Question

I’m wondering if interstellar travel is possible. So I guess the starting point is figuring out FTL travel.

In: 1302

Answer 1

For the same reason squarer-than-square shapes are impossible. A square is already as square as it gets (4 equal sides, 4 90 degree angles). The speed of light ultimately comes from the *geometry* of the universe, and while getting into the weeds on that is well beyond ELI5, I hope this little example helps show why it’s actually a nonsense question.