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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.
Consider the speed of light. Light, the fastest thing known, takes only 8 minutes to travel to us from the sun, but requires more than four years to get to the nearest star. A handgun bullet travels at 720 miles per hour, but would take nearly 4 million years to get to the nearest star. The fastest object ever launched into space is the Voyager 1 probe, and it would take nearly 75,000 years to make the trip. Todayâs chemical rockets are far too slow for interstellar travel.