Question

What is the speed of light? Can anything else move faster than? Explain.

Answer 1

The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is 299,792,458 metres per second.which is taken as 3×10^8 m/s.
Einstein's theory that nothing can travel faster than the speed of light in a vacuum still holds true, because space itself is stretching, and space is nothing. It is possible for a physical particle to travel faster than the speed of light. Such particles are given the playful name "tachyons", and we can't be sure that they don't exist.