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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.
4. Cheetah. The fastest animal in the world is of course the cheetah. This animal is actually only slightly faster than the pronghorn antelope, and can reach speeds of up to 61 miles per hour. This record was set by an 11 year old cheetah in 2012 named Sarah. Unlike most of the other animals on this list, the cheetah is a predator.