NASA's New Horizons probe launched in January 2006 as part of the New Frontiers program, built to reach farther into the solar system than any spacecraft before it. The film follows its nine-year journey to Pluto, then still debated as a planet, and the July 2015 flyby that returned the first close images of its surface, including the pale, heart-shaped plain later named Tombaugh Regio and its largest moon, Charon. Mission scientists and engineers describe the challenge of piloting a probe past a target three billion miles away with a communication delay of hours each way, and the footage moves between mission control celebrations and the raw data streaming back from the edge of the Kuiper Belt. The film also tracks New Horizons' extended mission beyond Pluto, deeper into the Kuiper Belt toward the next objects in its path. It is a straightforward account of one of the longest-running active spacecraft missions and what it found at the far edge of the solar system.