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Answer<br /> The fastest thing in the world - in fact the universe - know to man is light (or light particles called photons). Light travels at a speed on 186,000 miles per second. Another view Tachyon particles travel faster than light. Man-made The fastest man-made thing on Earth is the X-43 (Unmanned Aircraft). It can achieve a speed of Mach 9.8 or 7,460 mph. The X-15 is the fastest manned aircraft in the world which can reach Mach 6.72 or 5,115 mph.
Astronauts are by far the fastest traveling humans with the earth as a stationary reference point. One might think the Apollo missions to the moon are the fastest traveling humans, but the speed of that spacecraft was only about 6,300 miles per hour. In fact, an orbiting space shuttle is much faster at 17,600 miles per hour. This is the fastest any man has reached. Although it seems very fast to us, this speed is 0.026% of the speed of light. For unassisted speed using Usain Bolt's time in the 100 meter, his top speed is 23.3 miles per hour (10.4 m/s).