How Fast Does Light Travel? | 訂房資訊網

2018年3月6日—In1728,EnglishphysicistJamesBradleybasedhiscalculationsonthechangeintheapparentpositionofthestarsdueEarth'stravelsaroundthe ...

The speed of light traveling through a vacuum is exactly 299,792,458 meters (983,571,056 feet) per second. Thats about 186,282 miles per second — a universal constant known in equations as "c," or light speed. 

According to physicist Albert Einstein[1]s theory of special relativity[2], on which much of modern physics is based, nothing in the universe can travel faster than light. The theory states that as matter approaches the speed of light, the matters mass becomes infinite. That means the speed of light functions as a speed limit on the whole universe[3]. The speed of light is so immutable that, according to the U.S. National Institute of Standards and Technology[4] (opens in new tab), it is used to define international standard measurements like the meter (and by extension, the mile, the foot and the inch). Through some crafty equations, it also helps define the kilogram and the ...