173 - Time Travel Theory - One Minute History

The video explores the evolution of time travel concepts, starting with early philosophical ideas and HG Wells' influence. It discusses Einstein's theory of relativity, which introduced the idea that time can be altered by motion and gravity. The video also covers the 1950s scientific exploration of wormholes and spacetime tunnels, along with the grandfather paradox. In 1990, Stephen's chronological protection conjecture suggested that the laws of physics would prevent time travel paradoxes. Researchers have conducted experiments with atomic clocks and high-speed travel to observe small time effects, but practical time travel remains unachieved.

Explain the grandfather paradox and its implications for time travel.

What is the chronological protection conjecture proposed by physicists in 1990?