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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 cheetah is the fastest land animal in the world. They can reach a top speed of around 113 km per hour. A cheetah can accelerate from 0 to 113 km in just a few seconds. Cheetahs are extremely fast however they tire quickly and can only keep up their top speed for a few minutes before they are too tired to continue. Cheetahs are smaller than other members of the big cat family, weighing only 45 â 60 kilograms.