Part of Pluto’s giant nitrogen-ice glacier appears to move because solid ice can slowly deform and circulate over geological timescales. NASA’s New Horizons images show enormous polygon-like cells in Sputnik Planitia, the bright western lobe of Pluto’s heart. Scientists interpret these patterns as evidence of sluggish convection driven by heat from below.
Is the glacier made of the same ice as Earth’s glaciers?
Not mainly. Earth’s glaciers consist largely of water ice. Pluto’s cold basin contains nitrogen-dominated ice, along with methane and carbon monoxide ice. Under Pluto’s extraordinary temperatures and pressures, solid nitrogen is capable of deforming and moving. Water ice there acts more like rigid rock.
What do those giant polygons mean?
Images from the July 2015 New Horizons flyby revealed large, roughly cell-shaped surface patterns with narrow troughs between them. Research published in 2016 proposed that warmer, less-dense nitrogen ice rises slowly in the centers of cells, spreads outward, cools and sinks near their boundaries. The process is called solid-state convection and is not a lake of liquid nitrogen.
What did NASA report in August 2026?
On August 5, 2026, NASA reported a new analysis of archived New Horizons imagery. Researchers interpreted certain dark linear and diffuse features along northern Sputnik Planitia as possible evidence of temporary surface wetting by liquid nitrogen emerging from beneath the glacier. The study was published July 31, 2026. This is an interpretation of observational evidence, not a direct camera recording of flowing liquid.
Does that mean Pluto has rivers of liquid nitrogen?
Not ordinary open rivers flowing continuously across its surface. Pluto’s surface atmosphere and temperatures make stable exposed liquids very difficult. Researchers suggest brief emergence from subsurface conditions may explain the markings. The distinction matters: slow movement of solid glacier ice is better established than any specific proposed episodic liquid flow.
Why isn’t Pluto geologically dead?
A distant world can still evolve. Its volatile ices exchange with the atmosphere seasonally and redistribute over long periods, while interior heat may drive deformation in thick ice layers. Geological activity is not part of the definition that separates planets from dwarf planets.
Frequently asked questions
How fast does Sputnik Planitia move?
It does not move like a visibly flowing mountain stream. Convection models imply movement over very long timescales; the exact speeds depend on ice thickness, composition and temperature.
Is Pluto’s heart all one kind of ice?
No. Different regions contain differing mixtures and terrains; the glacier of Sputnik Planitia is only one portion of the larger heart-shaped region.
Did New Horizons land on Pluto?
No. The spacecraft made a flyby on July 14, 2015, gathering images and measurements remotely.
NASA research
NASA: Pluto’s Heart, Like a Cosmic Lava Lamp (2016); NASA: Evidence of Recent Liquid on Pluto’s Surface (August 5, 2026).
Leave a Reply