Pluto is far more geologically active than scientists ever expected

Space · Published 8 October 2026 Swipe more like this →

In short: When New Horizons flew past Pluto on July 14, 2015, it revealed a world that defies expectations. Instead of a frozen, stagnant relic, the spacecraft discovered a thick atmosphere and evidence of flowing ices, suggesting the dwarf planet remains geologically alive.

The New Horizons flyby provided a transformative look at Pluto, revealing features that challenged existing models of icy worlds. A startling finding involved a sunlit atmospheric haze reaching altitudes of 80 miles above the planet. Scientists suggest this haze forms when ultraviolet sunlight breaks apart methane gas. This unexpected atmospheric feature was captured by the Long Range Reconnaissance Imager. Such findings have forced researchers to reconsider the chemical processes occurring in the outer solar system.

Outside the atmosphere, the Long Range Reconnaissance Imager (LORRI) identified unusual ices that potentially flow across the terrain, resembling Earth's glaciers. This unexpected indicator of active geology appeared within Sputnik Planum, situated in western Tombaugh Regio, Pluto's heart-shaped area. This movement suggests that the surface is not a static landscape. Such activity provides a striking contrast to the traditionally perceived nature of distant Kuiper Belt objects.

The Ralph instrument's compositional findings provided more detail regarding this area, revealing that Sputnik Planum's centre contains abundant nitrogen, methane, and carbon monoxide ices. These findings, released during a NASA science update on July 24, 2015, suggest that Pluto is a complex, evolving world rather than a dormant sphere of ice. These specific chemical markers help scientists understand the complex composition of the dwarf planet. This data was part of a major briefing held at NASA headquarters.

The mission, which launched on January 19, 2006, was the first to explore Pluto and its five moons up close. Following the Pluto encounter, New Horizons moved toward its next major target, the Kuiper Belt Object Arrokoth (2014 MU69), arriving there in early 2019. The spacecraft's journey involved a significant gravity assist from Jupiter to reach its destination. It has since travelled much further from the Sun than Earth's orbit.

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