Before Einstein, special relativity, and E = mc2, what was the prevailing theory on the Sun's seemingly eternal energy?

Einstein's formula found that an object that has a mass cannot travel at the speed of light, while the other predicts the probability of finding a particle in a certain location at a given time.

Einstein's early years did not mark him as ... He developed a mathematical formula to explain that the visible motion of the particles was due to the invisible motion of the molecules of the ...

Once described by Einstein as "spooky action at a distance ... Osaka Metropolitan University physicists have developed new, simpler formulas to quantify quantum entanglement in strongly correlated ...

Einstein writing a density formula of the Milky Way on a blackboard, Pasadena Observatory, California, 1931, Source: Wikimedia Commons Photo of Albert Einstein in 1947 by Orren Jack Turner. Source ...