关于这张图
Utopia Planitia, a vast plain in the Northern Hemisphere of Mars, has an interesting and complex history. One of the intriguing features is a field of mounds showing circular depressions at their summits. The fact that many of these "craters" are on top of mounds argues against them being craters created by impacts, as is common on Mars and other planetary bodies across the solar system. There are many processes that can form such landforms, most notably hot lava. However, mud ejected from beneath the surface (through different geologic mechanisms) could also be a possibility. Being able to b…
