Space Daily August 23, 2026 • 01:30

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. - Space Daily

Special relativity allows a massive spacecraft to approach light speed but makes the required energy diverge as velocity approaches c.

A powerful enough engine can make a spacecraft move faster and faster. That familiar sentence contains a trap: it sounds as though every speed will eventually be reached if the engine runs long enoug… [+7851 chars]

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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. - Space Daily

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