New Horizons launched toward Pluto in 2006 and spent nine years crossing three billion miles at speeds fast enough that a collision with something as small as a grain of rice could have ended the mission. This film tracks the spacecraft's build, its slingshot past Jupiter, and the tense flyby that turned Pluto from a fuzzy telescope smudge into a mapped world with nitrogen glaciers, towering mountains, and a hazy blue atmosphere. Engineers and mission scientists explain how a probe the size of a piano was packed with instruments capable of photographing a dwarf planet three billion miles from home, and how the team plotted a course precise enough to thread it through a narrow window in space at over 30,000 miles per hour. The story continues past Pluto to New Horizons' extended journey into the Kuiper Belt and its encounter with the icy body Arrokoth, the most distant object ever visited up close. Archival mission control footage and interviews with the people who built and flew the spacecraft carry the narration throughout.