The speed of light in a vacuum is measured at 186,282 miles per second, which is 670,616,629 miles per hour. The speed of light is denoted mathematically by the symbol "c." More » Science Physics

Optimally, Mach 2 is 1,552.4141 mph. This measurement is twice the speed of a moving object relative to the speed of sound in a surrounding medium when placed under ambient conditions. More » Science Measurements

The speed of light is about 670,616,629 mph, and one could travel round the earth 7 1/2 times in just a second with this speed. For another perspective, the average distance from the Earth to the Moon is 238,854 miles, a... More » Science Physics Motion & Mechanics
similar articles

Light typically travels at 186,000 miles per second, but scientists have found a way to slow it down to 38 miles per hour. A team at the Rowland Institute for Science has found a new state of matter to help slow light do... More » Science Physics

In a vacuum, the speed of light is 186,282 miles per second. This is equal to 299,792 kilometers per second or about 670,616,629 miles per hour. More » Science Physics Electricity

When light travels in a vacuum, its speed is 186,282 miles per second. The fastest aircraft, which is the Boeing-43 scramjet, has a speed of 7,546 miles per hour. If these two speeds are compared, the jet's speed is appr... More » Science Physics Optics & Waves

Light travels at 186,282 miles per second, or approximately 670,616,629 miles per hour, in a vacuum. As of 2014, it is assumed that no object that has mass can travel at or above this speed. More » Science Physics Motion & Mechanics