Why can’t anything travel faster than light in vacuum?
Quick Answer
According to relativity, the speed of light is a cosmic speed limit built into spacetime. As an object approaches that speed, its energy requirement rises dramatically.
The Full Story
Einstein’s special relativity, published in 1905, showed that the speed of light in vacuum is the same for all observers. Because of that structure, massive objects need ever-increasing energy to go faster and would require infinite energy to reach the speed of light. This is why no known object with mass can exceed about 299,792,458 meters per second in vacuum. The limit is not just about light itself; it is a property of spacetime and causality. Many modern technologies, from GPS timing to particle accelerators, must account for relativity.
Key Facts
YouTube Angle
Suggested video title for this topic:
"Why is light speed the universe’s top speed?"