fastest thing in existence
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.