点击这里观看更多视频:https://alugha.com/NASA 美国国家航空航天局的空中雪观测站收集的数据可以帮助改善全球15亿人的水资源管理，这些人依靠融雪来供水。这段视频在美国宇航局科学直播节目《庆祝地球日的奇异世界》第三集现场直播。
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
