NASA 使用立方体卫星执行新的科学任务，并测试包含在大型飞行任务中的新电子、传感器和软件。 欲了解更多信息，请访问：https://www.nasa.gov/content/about-cubesat-launch-initiative 美国航空航天局科学：http://science.nasa.gov/ 点击这里查看更多视频：https://alugha.com/NASA
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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
