Glaciers that still exist on the surface of Mars are helping to tell the story of its past.
원문출처 : https://www.cnn.com/2021/01/20/world/mars-glaciers-ice-ages-scn/index.html
원문출처 : https://www.cnn.com/2021/01/20/world/mars-glaciers-ice-ages-scn/index.html