things can travel faster than light in a medium other than a vacuumIt creates Cherenkov radiation..The interesting thing is that at the speed of light in a vacuum, anything with rest mass would have rest mass divided by zero, or infinite mass..So even a single electron would have infinite mass at the speed of light..It would also have infinite energy and would take infinite energy to get it up to that speed..Since the universe has less than infinite (also known as finite) energy, there is not enough energy in the universe to get even a single electron all the way up to the speed of light in a vacuum. (Very close is possible, but not all the way.).This is good because with infinite mass, it would also create a black hole of infinite size with infinite gravitation and would destroy the universe.
things can travel faster than light in a medium other than a vacuumIt creates Cherenkov radiation..The interesting thing is that at the speed of light in a vacuum, anything with rest mass would have rest mass divided by zero, or infinite mass..So even a single electron would have infinite mass at the speed of light..It would also have infinite energy and would take infinite energy to get it up to that speed..Since the universe has less than infinite (also known as finite) energy, there is not enough energy in the universe to get even a single electron all the way up to the speed of light in a vacuum. (Very close is possible, but not all the way.).This is good because with infinite mass, it would also create a black hole of infinite size with infinite gravitation and would destroy the universe.