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 »

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 »

1,802,613,657,600 furlongs per fortnight. This number is easily calculated from the different fixed unit conversions and the speed of light, which is an accepted constant. More »

The speed of light in mph (miles per hour) is 6.702 x 108 mph or more precisely 670,616,629 mph. In metric units, the speed of light in a vacuum is 2.998 x 108 m/sec. More »

The speed of sound in dry air is approximately 344 meters per second, or 770 miles per hour. This assumes dry air at sea level with a temperature of 68 degrees Fahrenheit. More »

As of 2014, the fastest rocket ship, NASA's New Horizons spacecraft, was recorded at a speed of 36,000 miles per hour. The speed a spacecraft travels depends on if it is ascending, orbiting or returning to Earth. More »

Breaking the sound barrier requires exceeding the speed of sound, which is approximately 761 miles per hour at seal level when the air temperature is 59 degrees Fahrenheit. As the temperature decreases, the speed of soun... More »