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→Evidence for Relativity
==Evidence for Relativity==
==Evidence for Relativity==
=== Twin Paradox ===
No particle accelerator built since the 1950s would work unless the mass increase predicted by special relativity not only occurred, but occurred to the precise degree predicted by the theory.{{fact}} In 1972, scientists flew extremely accurate clocks around the world in both directions on commercial airlines, and were directly able to observe the relativistic "twin paradox" the eastbound clock gained 273 ns and the westbound clock lost 59 ns, matching the predictions of general relativity to within experimental accuracy.<ref>as described in [http://math.ucr.edu/home/baez/physics/Relativity/SR/experiments.html What is the experimental basis of Special Relativity?], a personal web page, which cites Haefele and Keating (1972), ''Science'' Vol. 177 pp 166-170 as its source</ref><ref>Sullivan, Walter (1972), "Relativity Theory Awaits Affirmation", September 23, 1972, p. 61. Note: Article refers to a different experiment, which Sullivan discusses, saying that if successful it would be "the second time within a year" that relativity had been confirmed, then proceeds to discuss Hafele[sic] and Keating's experiment as the first.</ref>
No particle accelerator built since the 1950s would work unless the mass increase predicted by special relativity not only occurred, but occurred to the precise degree predicted by the theory.{{fact}} In 1972, scientists flew extremely accurate clocks around the world in both directions on commercial airlines, and were directly able to observe the relativistic "twin paradox" the eastbound clock gained 273 ns and the westbound clock lost 59 ns, matching the predictions of general relativity to within experimental accuracy.<ref>as described in [http://math.ucr.edu/home/baez/physics/Relativity/SR/experiments.html What is the experimental basis of Special Relativity?], a personal web page, which cites Haefele and Keating (1972), ''Science'' Vol. 177 pp 166-170 as its source</ref><ref>Sullivan, Walter (1972), "Relativity Theory Awaits Affirmation", September 23, 1972, p. 61. Note: Article refers to a different experiment, which Sullivan discusses, saying that if successful it would be "the second time within a year" that relativity had been confirmed, then proceeds to discuss Hafele[sic] and Keating's experiment as the first.</ref>
=== GPS and Relativity ===
[[Gravitational time dilation]] is observed in GPS satellites<ref>http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/gps.html</ref> as part of General Relativity where a clock that is further from a massive body will run faster than one that is closer to a massive body. General predicts that the clock on a satellite will tick 45ms/day faster than one at sea level. Additionally, the satellite is in motion with respect the observer on Earth and Special Relativity predicts that the clock will tick 7ms/day slower than one on Earth. The clocks on a GPS satellite are observed to run 38ms/day faster than a clock at sea level - the difference between 45ms and 7ms. Failure to account for these relativistic effects would result in GPS satellites giving the wrong information that would be perceived by a GPS receiver as being off by 10km each day.
==Pending Research==
==Pending Research==