The ruler length and width measurements reflected the largest bias, regardless of wound shape [8]. The standard error of measurement (SEM) is defined as the difference between an observed score and a true score, so the SEM is an indication of the imprecision of a measurement technique [17].
Washington: Runaway planets zipping through space at mind-numbing speeds of 30 million miles per hour are now the fastest objects in the universe, says a study. Seven years ago, the discovery of the first runaway star, shooting out of our Galaxy at a staggering speed of 1.5 million mph, set astronomers on a course of exploration.
Speed of light. The speed of light is the speed at which light travels in empty space. Physicists often use the letter c to denote the speed of light. It has the value 299,792,458 meters per second (or about 186,282.397 miles per second). A photon (particle of light) travels at this speed in a vacuum. According to special relativity, c is the maximum speed at which all energy, matter, and physical information in the universe can travel.