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Time Is Local Not Universal
- Einstein showed time is local: clocks tick at different rates depending on speed and gravity, so time isn't universal.
- This makes real forward time travel possible by motion or strong gravity, measurable in experiments.
Clocks On Planes Proved Time Dilation
- Brian describes the Hafele–Keating airplane experiment comparing atomic clocks on a jet and on the ground.
- The observed time differences matched Einstein's predictions, proving time dilation is real.
You Age Less Locally In Strong Gravity
- Traveling into the future is straightforward under relativity: moving or being in stronger gravity makes you age less relative to others.
- Locally you notice nothing because all processes, even thoughts, slow equally.