NASA’s New Horizons — the only spacecraft that has visited the Kuiper Belt — took nine and a half years to reach Pluto. The space probe was moving at a speed of 58,580 km/h (36,400 mph) and traveled a distance of about 5 billion km (3 billion miles). It should be noted that at the time of its launch in 2006, New Horizons was the fastest spacecraft ever built.