The Physics of Time Travel

Time travel, in physics, is primarily rooted in Einstein's theory of relativity. According to this theory, time is not constant; it can be affected by speed and gravity. The faster an object moves or the stronger the gravitational field it’s in, the slower time passes for it relative to others. In theoretical models, concepts like wormholes and warp drives suggest pathways through space-time that could allow for time travel. However, these remain speculative, and practical time travel poses immense technological and energy challenges, making it currently impossible by our understanding of physics.