North Polar Layers

Millions of years of alternating seasons have created the north polar cap. Ice is laid down during the winter and dust coats the ice in summer. The ice/dust cycle creates layers as the cap grows. The layers are revealed on the side of troughs that are eroded down into the cap. Orbit Number: 77621 Latitude: 85.4338 Longitude: 173.148 Instrument: VIS Captured: 2019-06-14 15:23 https://photojournal.jpl.nasa.gov/catalog/PIA23361