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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.
The fastest thing in the whole. universe is the speed of light in a vacuum (like outer space!), clocking in at a great 2.99 x 10 8. m/s. Light. travels in waves , and we call this traveling propagation . Propagation of waves has both a speed and a. direction, called the velocity . The velocity of light changes depends on the material it travels through. Light waves can be changed in a few different ways. Reflection is when the waves bounce off a. surface and change direction, like when they hit a mirror or pool of water.