One of the most famous paradoxes of all of physics – who's older? Who's younger? and WHY? ***** Thanks to The Great Courses Plus (free trial here: http://ow.ly/RCty302dIHU) for supporting MinutePhysics *****

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This video is about the famous “Twins paradox” of special relativity, how time can appear to be faster for two different observers at the same time, and which twin really is older (or younger) – the one who stays on earth or the one who flies in a rocket ship to the stars?

Music by Nathaniel Schroeder, http://www.soundcloud.com/drschroeder

REFERENCES

Muon lifetime and time dilation/relativity: http://hyperphysics.phy-astr.g....su.edu/hbase/relativ

MinutePhysics video about Time Rotations & Einstein: https://www.youtube.com/watch?v=ajhFNcUTJI0

Experimental test of time dilation using doppler shift of light: https://en.m.wikipedia.org/wik....i/Ives–Stilwell_expe

Lorentz Transformations: https://en.m.wikipedia.org/wik....i/Lorentz_transforma

Relativity of Simultaneity: https://en.wikipedia.org/wiki/....Relativity_of_simult

Paper on twin paradox under constant acceleration: https://arxiv.org/pdf/physics/0604025v3.pdf

Taking Cesium atomic clocks aboard airplanes: https://en.wikipedia.org/wiki/....Hafele–Keating_exper

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Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!

Created by Henry Reich