地球重力图
(原标题: A Gravity Map of Earth)
2026-03-24
浏览次数: 1514
地球表面的重力是一样的吗？不——在某些地方你会觉得比其他地方稍微重一些。这段精选的地球地图视频用彩色和夸张的高低显示了地球引力场的强弱。蓝色的低海拔点，你会觉得稍微轻一点，就在印度海岸附近，而相对较高的海拔点则出现在南美洲智利的山区。这些不规则的原因并不总是遵循目前的表面特征。科学家们假设，其他重要因素存在于地幔深处的地下结构中，可能与地球在遥远过去的样子有关。这张特色地图是由2002年至2017年美国宇航局的双GRACE卫星拍摄的数据组成的。GRACE通过仔细跟踪两颗卫星之间距离的微小变化来绘制地球引力图。
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Is gravity the same over the surface of the Earth? No -- in some places you will feel slightly heavier than others. The featured Earth map video shows in colors and exaggerated highs and lows where the gravitational field of Earth is relatively strong and weak. A low spot, where you would feel slightly lighter, can be seen just off the coast of India, in blue, while a relative high occurs in the mountains of Chile in South America. The cause of these irregularities does not always follow present surface features. Scientists hypothesize that other important factors lie in deep underground structures in Earth's mantle and may be related to the Earth's appearance in the distant past. The featured map was composed from data taken by NASA's twin GRACE satellites that orbited the Earth from 2002 to 2017. GRACE mapped Earth's gravity by carefully tracking tiny changes in the distance between the two satellites.