New Horizons Mission Phases

New Horizons Prime Mission

The New Horizons spacecraft launched on January 19, 2006 — beginning its odyssey to Pluto and the Kuiper Belt. New Horizons was the first mission to Pluto, completing the space-age reconnaissance of the planets in our solar system that had started 50 years earlier. It was also the first mission to explore the solar system's recently discovered "third zone," the region beyond the giant planets called the Kuiper Belt.

But New Horizons began long before launch, starting with many years of work to design and propose the mission, build the spacecraft and its array of instruments, and plan the operations and scientific observations that would bring these new worlds into focus for the first time. The flyby of Pluto on July 14, 2015, was a resounding success, and New Horizons sent home data that resulted in profound new insights about Pluto and its moons. These data will continue to be analyzed for many years to come. Read more about the Pluto flyby here.

First Kuiper Belt Extended Mission

In its first mission extension, New Horizons continued on its unparalleled journey of exploration with the first-ever exploration of a primordial Kuiper Belt object (KBO) called 2014 MU69 — officially named Arrokoth (Powhatan/Algonquian for "sky") — on January 1, 2019.

The Kuiper Belt is a scientifically rich frontier. Its exploration has important implications for better understanding comets, small planets, the solar system as a whole, the solar nebula and disks around other stars. It's a laboratory for studying well-preserved primitive material from the planet formation era 4.5 billion years ago.

New Horizons approached Arrokoth three times closer than it came to Pluto, resulting in even more detailed pictures and other kinds of data. The spacecraft obtained the first high-resolution geological and compositional maps of a small KBO, while conducting sensitive searches for atmospheric activity, satellites and rings. Read more about the Arrokoth encounter here.

Second Kuiper Belt Extended Mission

Now in its second mission extension, New Horizons is searching for another flyby target and has already taken advantage of its distant position to execute otherwise unachievable and impactful investigations benefiting all three of NASA’s Science Mission Directorate space science divisions — Planetary Science, Heliophysics and Astrophysics. Read more about New Horizons' second extended mission goals and accomplishments to date here.