New Horizons (Pluto Flyby)

5 billion km to Pluto. Found nitrogen glaciers and ice mountains. Most distant flyby ever.

Launched in 2006—before Pluto's demotion—New Horizons traveled 5 billion km to reach the dwarf planet in July 2015. The first close-up images revealed a geologically active world with nitrogen glaciers, the heart-shaped Tombaugh Regio (1,000 km wide), and water-ice mountains as tall as the Rockies. It then flew past Arrokoth in 2019, the most distant object ever visited at 6.6 billion km.

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