faster-than-light (FTL) travel has not been ruled out definitively, but it is not supported by the current scientific understanding and theories. The theory of special relativity, which has been extensively tested and confirmed by numerous experiments, sets the speed of light in a vacuum as an absolute speed limit.
According to special relativity, as an object with mass accelerates towards the speed of light, its relativistic mass increases, requiring an infinite amount of energy to reach or exceed the speed of light. Additionally, time dilation and length contraction occur, leading to various paradoxes and violations of causality if FTL travel were possible.
While there have been speculative theories and ideas that propose the existence of phenomena like wormholes or warp drives that could potentially allow for FTL travel, these concepts remain highly theoretical and speculative. They have not been experimentally verified or widely accepted by the scientific community.
It is important to note that scientific understanding is continually evolving, and new discoveries and theories could potentially challenge our current understanding of the universe. However, at present, FTL travel is not supported by empirical evidence or established scientific theories.