关于这张图
This VIS image of the south polar cap shows a surface with hundreds of circular depressions. This texture similar in appearance to swiss cheese. Orbit Number: 64535 Latitude: -86.8715 Longitude: 354.786 Instrument: VIS Captured: 2016-07-01 14:50 http://photojournal.jpl.nasa.gov/catalog/PIA20974
