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STThe conclusion, scientists said, is based on images showing what looks like an ancient gravel stream bed. One of the stream bed slabs appears to be made of gravel cemented together by water that once ran freely on Mars and settled on the floor of Gale Crater, likely several billion years ago.
To be edited科学家表示，此一结论的依据是影像上有看起来像是远古碎石河床的结构。河床上的一块岩石似乎是由水把碎石黏合所形成。在数十亿年前，水很可能曾在盖尔陨石坑奔流无阻。