The surface of Mars is covered in intriguing features that suggest hints about the planet's past and the water that once existed on its surface.
원문출처 : https://www.cnn.com/2020/05/18/world/mars-mud-lava-flows-scn/index.html
원문출처 : https://www.cnn.com/2020/05/18/world/mars-mud-lava-flows-scn/index.html