Pluto surface ice

Pluto, the dwarf planet, has a surface covered with ices of nitrogen, methane and carbon monoxide, revealing an active and complex geology.

About this subject

Pluto's surface is predominantly composed of volatile ices, such as nitrogen, methane and carbon monoxide, forming a dynamic and varied crust. Data from NASA's New Horizons mission, which flew by the dwarf planet in 2015, showed that these frozen substances cover vast plains, such as Sputnik Planitia, an impact basin filled with nitrogen ice. This ice behaves similarly to terrestrial glaciers, flowing slowly and creating polygonal convection patterns.

In addition to nitrogen, methane ice appears in higher regions, such as on water-ice mountains that rise up to 4 km in altitude. Carbon monoxide ice is present in smaller concentrations, usually mixed with other ices. The presence of these materials indicates that Pluto has an active climate cycle, with seasonal sublimation and condensation influenced by its 248-year elliptical orbit around the Sun.

Surface geology includes faults, craters, and possible cryovolcanoes, suggesting that the dwarf planet's interior is still thermally active. The ice layer is estimated to be hundreds of meters thick in some areas, hiding a subsurface ocean of liquid water kept warm by radioactive decay. This combination of surface ices and internal activity makes Pluto one of the most fascinating bodies in the solar system, challenging the view that dwarf planets are geologically dead.

Frequently Asked Questions

What is Pluto's surface ice made of?

Pluto's surface ice is primarily composed of nitrogen, methane, and carbon monoxide. Nitrogen is the most abundant, followed by methane which appears in higher elevations.

How did scientists discover the composition of Pluto's ice?

The composition was determined by spectrometers aboard the New Horizons probe during the 2015 flyby, which analyzed reflected light from the surface and identified chemical signatures of different ices.

Is there water on Pluto?

Yes, there is water ice on mountains and possibly a subsurface ocean of liquid water beneath the ice crust. However, exposed water on the surface is scarce and usually in the form of hard ice.