NASA的卡西尼号空间探测器即将飞过土星的卫星-土卫二上方的一个喷泉。 更多内容请访问http://science.nasa.gov/。 点击这里查看更多视频：https://alugha.com/NASA 此为2015年的视频
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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
