New Evidence of Massive Landslides on Pluto
Recent work by a team led by geologist Marco Emanuele Discenza has turned the long‑standing perception of Pluto on its head. By revisiting the high‑resolution pictures taken by the New Horizons spacecraft in 2015, researchers have identified six distinct, gigantic landslides that have reshaped the dwarf planet’s surface. These icy‑rock avalanches are not modest slope failures; they span distances of up to fourteen kilometres horizontally and plunge more than two kilometres vertically, dwarfing comparable features on Mars, Ceres or even Pluto’s own moon Charon.
How the Data Were Re‑examined
The team focused on images captured by LORRI, the Long‑Range Reconnaissance Imager, which can resolve objects as small as three hundred metres. Earlier attempts to spot large‑scale mass movements on Pluto produced ambiguous hints, but the new analysis applied refined mapping techniques and a fresh eye for half‑moon‑shaped scarps along crater rims. Six clear signatures emerged, all clustered around the inner edges of three impact basins that border the heart‑shaped Sputnik Planitia, a vast plain of nitrogen ice.
Scale and Appearance of the Slides
One of the most striking examples lies in the Giclas crater, where the debris field blankets roughly 130 square kilometres—an area large enough to swallow an entire modern city. The displaced material forms rough, jagged aprons at the base of crater walls, peppered with massive blocks of frozen ice. In other cases, the debris has travelled more than ten kilometres across the surface before finally coming to rest, creating a landscape that looks as if a colossal wave of ice and rock has frozen in place.
Why Pluto’s Slides Are So Mobile
The extraordinary mobility of these flows is largely a product of Pluto’s weak gravity and the slippery nature of its icy regolith. With surface gravity barely one‑tenth that of Earth, even modest forces can set large volumes of material in motion. Moreover, the low friction between icy fragments allows them to glide far beyond what would be possible on a rockier world. This combination yields landslides that rival the most dynamic on Mars and Ceres, despite occurring on a world once thought to be geologically dead.
Uncertain Triggers and Hidden Activity
While the slide in the Coughlin crater appears to have been sparked by a smaller impact near the rim, the origins of the remaining five events remain speculative. One plausible driver is thermal stress within the surface ice. Pluto’s elliptical orbit subjects it to subtle temperature swings, causing volatile compounds such as nitrogen and methane to sublimate and re‑condense. These cycles can generate internal pressure and destabilise slopes, prompting sudden collapses. Because New Horizons only imaged a fraction of Pluto’s terrain at high resolution, many more landslides may be concealed in the lower‑resolution data or await discovery in regions yet to be photographed in detail.
Implications for Planetary Science
The confirmation of active, large‑scale mass wasting on Pluto reshapes our understanding of dwarf‑planet geology. It demonstrates that even worlds far from the Sun can experience vigorous surface reshaping, driven by a mix of impact events, volatile dynamics, and the unique physics of low‑gravity icy environments. As researchers continue to mine the existing dataset and plan future missions, Pluto is poised to become a key laboratory for studying how ice‑rich bodies evolve over billions of years.
Source: https://scientias.nl/reuzenaardverschuivingen-op-pluto/
