Physicscalendar_todayLast updated: Apr 2026
What is Relativity?
/ˌreləˈtɪvɪti/
Einstein's two theories (Special, 1905; General, 1915) describing how space, time, and gravity work. Special relativity shows time and space are relative to the observer; General relativity describes gravity as the curvature of spacetime.
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Everyday Example
GPS satellites travel fast and sit in weaker gravity than Earth's surface — both of which affect time. Without corrections for relativity, GPS would drift by 10km per day. Every navigation app on your phone depends on Einstein's equations.
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“The first experimental confirmation of General Relativity came during the 1919 solar eclipse, when Arthur Eddington measured starlight bending around the sun. Einstein became a global celebrity overnight — the first scientific superstar.”
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Did you know?
Einstein published Special Relativity in 1905 while working as a patent clerk, aged 26. He had no university position, no lab, and no collaborators. The paper was written in his spare time and changed physics forever.
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Key Insight
Relativity tells us time is not a fixed backdrop — it's a dimension that can stretch and compress. Your feet age fractionally slower than your head because they're slightly closer to Earth's gravity. Time is personal.
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