Nothing Can Travel Faster Than Light

The universe operates under a strict speed limit, a principle established by Albert Einstein's 1905 theory of special relativity. Before Einstein, it was assumed you could always go faster by simply applying more force. However, he revealed that as an object with mass accelerates, its inertia increases. This means the object effectively gets "heavier" and more resistant to changes in its speed. At everyday velocities, this effect is imperceptibly small, but as an object approaches the speed of light, its inertia skyrockets. Pushing it that final fraction of a percent closer to light speed requires a nearly infinite amount of energy, making it a physical impossibility.

This cosmic speed limit isn't just a barrier for travel; it's the fundamental speed of causality. It's the maximum rate at which information or any effect can travel through the fabric of spacetime. This rule is confirmed daily in particle accelerators, where scientists can accelerate subatomic particles to over 99.99% of light speed but can never push them over the final threshold, no matter how much energy is used. Interestingly, this limit applies to objects moving *through* space. The expansion of spacetime itself can carry distant galaxies away from us faster than light, but the galaxies themselves are not breaking any local speed laws.