Pluto closer to home

Explanation: Figure 1: Examples of polygons on the Earth, Mars and Pluto. A) Freeze-thaw polygons in the periglacial terrain of Mars. In this image from NASA’s High Resolution Imaging Science Experiment, frost is highlighting the cracks at the edges of each polygon. Looking closely we can see smaller polygons within the larger polygons. The image is approximately 12 miles (20 kilometers) across. Credit: NASA B) New Horizons’ image of a ~ 120 mile (200 kilometer) wide section of ‘Sputnik Planum’ on Pluto. Credit: NASA/JHUAPL/SwRI C) Fracture polygons on a frozen lake on Earth. The image is approximately 13 feet (4 meters) across. Credit: Paul Schenk D) Mud crack polygons on Earth. This image shows large polygons (~ 33 feet or 10 meters across), and the smaller mud cracks within them, created as a muddy surface dries out. See it for yourself at Red Lake Playa in Death Valley. Credit: Jason Barnes


Image credit: NASA/JHUAPL/SwRI/Paul Schenk/Jason Barnes/Veronica Bray