With a goal of reaching 1,000 astronomical units – about 1,000 times the distance between Earth and the Sun – Interstellar Probe would take humanity's first deliberate step on the path to the stars. Traveling farther and faster than even the legendary Voyager spacecraft, Interstellar Probe would begin its flyby phase of objects and dwarf planets in the Kuiper Belt in just about four years. Ten to 15 years after launch, the mission's outer heliosphere phase would commence – a mark the Voyager missions took more than 40 years to reach. Ultimately, after 50 years, the Interstellar Probe would reach the pristine interstellar medium and zoom deeper into the galaxy to explore as long as its power source would allow.