![]() Ironically, their paper laid the foundation for what today is called the EPR (Einstein-Podolsky-Rosen) paradox, a paradox that describes this instantaneous communication of quantum entanglement - an integral part of some of the world's most cutting-edge technologies, like quantum cryptography. Even in air, which is nearly a vacuum, light slows down slightly. For instance, when it moves through glass, it slows down to about two-thirds of its speed in a vacuum. However, light actually slows down as it passes through different media. ![]() In fact, in 1935, Einstein, Boris Podolsky and Nathan Rosen, attempted to disprove quantum theory with a thought experiment on what Einstein referred to as "spooky actions at a distance." The value of 299,792,458 meters per second (186,282 miles per second) is the speed of light in a vacuum. Einstein thought that this therefore disproved the quantum theory, since nothing can go faster than light," Kaku wrote. "If I jiggle one electron, the other electron 'senses' this vibration instantly, faster than the speed of light. Rmers estimation of lights speed was inaccurate due. Now, separate those two electrons so that they're hundreds or even thousands of light years apart, and they will keep this instant communication bridge open. As such, an estimation of lights speed was made by dividing the diameter of Earths orbit by 22 minutes. ![]() In this figure, S is the Sun, E1 is the Earth when closest to Jupiter (J1) and E2 is the Earth about six months later, on the opposite side of the Sun from. Roemer measured the speed of light by timing eclipses of Jupiter's moon Io. "If I have two electrons close together, they can vibrate in unison, according to the quantum theory," Kaku explains on Big Think. In 1676, the Danish astronomer Ole Roemer (16441710) became the first person to measure the speed of light. Account icon An icon in the shape of a person's head and shoulders. ![]()
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