The Secret Physics That Stops Time Travel Einstein’s relativity allows for the strange idea of closed timelike curves—mathematical loops through spacetime that could, in theory, let you travel into the past. Many physicists believe that once quantum mechanics is fully combined with general relativity, these “time travel” possibilities might vanish. Could quantum physics be the final barrier to time travel? #timetravel #einstein #physicsexplained #relativity #quantumgravity #quantumphysics #cosmo