description Sputnik Planitia Overview
Sputnik Planitia is a large impact basin located on Pluto’s surface composed primarily of nitrogen ice. This ancient feature dominates the western portion of Tombaugh Regio, Pluto's most recognizable region. Its immense size and unique composition make it significant for understanding Pluto’s geological history and the processes shaping icy worlds. Scientists study Sputnik Planitia to learn about dwarf planet formation and evolution.
help Sputnik Planitia FAQ
What is Sputnik Planitia on Pluto?
Sputnik Planitia is a massive, glacier-like plain on Pluto, composed primarily of slowly flowing nitrogen and carbon monoxide ice. It forms the western lobe of the heart-shaped Tombaugh Regio region photographed during the Pluto flyby.
Why is Sputnik Planitia located near Pluto's equator?
Scientists believe Sputnik Planitia is positioned near Pluto's tidal axis due to a positive mass anomaly. The sheer weight of the accumulated nitrogen ice caused the dwarf planet to roll over millions of years to balance its rotational axis.
Does the ice in Sputnik Planitia move?
Yes, the nitrogen ice in Sputnik Planitia behaves like a viscous fluid due to the internal heat radiating from Pluto's rocky core. The ice slowly convects, constantly upwelling and renewing the surface, which explains why the plain has virtually no impact craters.
How was Sputnik Planitia photographed?
The detailed images of Sputnik Planitia were captured by NASA's New Horizons spacecraft. New Horizons conducted a historic, high-speed flyby of Pluto in July 2015, revealing the complex geology of the dwarf planet for the first time.
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