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問題 · 2026-05-27
光速是物體的極限速度，因為相對論限制了具有質量的物體超越它。
光速是物體可以達到的極限速度，這是由相對論所規定的。當物體接近光速時，其相對論質量會趨於無窮大，需要無窮大的能量才能繼續加速。光子因為沒有質量，因此可以以光速行進。這種限制並非技術問題，而是宇宙的基本物理定律。
根據相對論，物體的速度增加時，時間會變慢，質量會增加，因此需要更多的能量來推動它。這些效應使得任何具有質量的物體都無法達到或超越光速。
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