Physics says a spacecraft with mass can never reach the speed of light: as it accelerates closer to c, the energy required rises without limit, so light speed isn’t merely difficult to reach — for massive objects, it’s physically unattainable.

Special relativity allows a massive spacecraft to approach light speed but makes the required energy diverge as velocity approaches c. The post Physics says a spacecraft with mass can never reach the speed of light: as it accelerates closer to c, the energy required rises without limit, so light speed isn’t merely difficult to reach — for massive objects, it’s physically unattainable. appeared…