NASA支持研究员研究，为什么格陵兰岛的冰层融化速度比之前想象的要快。而整个过程是在海平面下进行的。 更多信息请访问http://science.nasa.gov/。 点击这里查看更多视频：https://alugha.com/NASA 此视频在2015发表
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Visit http://science.nasa.gov/ for more. Earth is surrounded by electrons that can be disruptive to our technology. NASA is using high-altitude balloons and spacecraft to monitor and understand these particles in the radiation belts surrounding our planet. Click here to see more videos: https://al
Explore how astronomers and scientists use astronomical units to measure distances in the solar system in this video adapted from NASA. The astronomical unit (au) -- equal to the average distance from Earth to the Sun -- is a convenient unit of measure when talking about distances in the solar syste
