Fermilab physicist Don Lincoln explains a well-known thought experiment examining the consequences of special relativity. “Time waits for no man” goes the saying, and it appears to be true. Inexorably ...

One of Albert Einstein's greatest insights was realizing that time is relative. It speeds up or slows down depending on how fast one thing is moving relative to something else. How much does it change ...

An experiment using lasers to test Einstein’s so-called ‘twin paradox’ could help find a way to make more accurate GPS. A scientific theory proposed by Albert Einstein and featured in the sci-fi ...

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More accurate clocks and sensors may result from a recently proposed experiment, linking an Einstein-devised paradox to quantum mechanics. A physicist said the international collaboration aimed to ...

(via TEDEd) On their 20th birthday, identical twin astronauts volunteer for an experiment. Terra will remain on Earth, while Stella will board a spaceship. Stella’s ship will travel to visit a star ...

Last week's lesson was time dilation, and you hopefully understand the basics of how it works. Cliff notes: According to Einstein's theory of relativity, the faster you travel, the slower time passes.