关于这张图
This VIS image of the south polar cap was taken during the middle of southern hemisphere summer. The surface is free of frost and the layering that makes up the cap is visible. The layers formed over thousands of years, with the seasonal influx of dust and ice. Orbit Number: 75229 Latitude: -84.5325 Longitude: 158.478 Instrument: VIS Captured: 2018-11-29 14:47 https://photojournal.jpl.nasa.gov/catalog/PIA23014
