火星上的古代冰崖

Scientists have come to realize that, just below the surface, about one third of Mars is covered in ice. We study this ice to learn about Mars’ ancient climate and astronauts’ future water supplies.

Sometimes we see the buried ice because cliffs form like the one in this image. On the brownish, dusty cliff wall, the faint light-blue-colored ice shows through. Some of these cliffs change before our eyes and boulders of ice can tumble downhill. We take repeat images of these scenes to check for changes like this.

Image Credit: NASA/JPL-Caltech/University of Arizona

科学家们已经意识到，就在火星表面之下，大约三分之一的火星被冰覆盖着。我们研究这些冰是为了了解火星远古的气候和宇航员未来的水供应。

有时我们看到埋在地下的冰，因为悬崖形成了，就像图中所示的那样。在灰蒙蒙的褐色崖壁上，隐约可见浅蓝色的冰。有些悬崖在我们眼前改变，冰砾可以滚下山坡。我们重复拍摄这些场景的图像来检查像这样的变化。

图片来源:美国国家航空航天局/加州理工学院/亚利桑那大学