When an object moves extremely fast—close to the speed of light—certain basic assumptions that we take for granted no longer ...

Albert Einstein had described the special theory of relativity in 1905. The result of Einstein's thinking about light, this theory introduced brand-new ideas to science. It opened up an entire ...

Noether’s eponymous theorem was inspired by Albert Einstein’s work on relativity in the early years of the 20th century, culminating in his general theory of relativity in 1915. It formalised ...

Einstein’s general theory of relativity can be summed up in just 12 words: “Space-time tells matter how to move; matter tells space-time how to curve”. But this short description from the ...

On 25 November 1915, Albert Einstein presented his general theory of relativity at the Prussian Academy of Sciences. This theory is still considered to be the most important idea in modern physics.

This celebrated consequence of the special theory of relativity is that two clocks ... The effect rests on nothing other than the Pythagorean theorem ...