Physics
Gravitational Time Dilation
Quick fact
Even on Earth, clocks at higher altitudes gain about 45 microseconds per day compared to clocks at sea level, a measurable effect of gravitational time dilation.
Why this is interesting
Have you ever wondered why time seems to flow differently near a massive object? Gravitational time dilation, predicted by Einstein's general relativity, means that clocks tick slower closer to a source of gravity.