Why acceleration never carries matter past light speed

The reading asks why an otherwise empty universe should prevent a rocket from accelerating without limit. Even at an acceleration of ten times Earth gravity, a traveller would need months to approach light speed and would endure an impractical physical load. Adding energy continues to increase velocity, but each increment produces less gain and the rocket never reaches 300 million metres per second. Nothing strikes a barrier or suddenly fails; the limit is built into the relationship between motion, space, and time. Relativistic effects exist at ordinary speeds as well, although they are too small to notice in daily life. The passage turns a famous numerical limit into a lesson about how velocities themselves behave differently from the expectations of everyday mechanics.