点击这里观看更多视频: https://alugha.com/NASA 美国国家航空航天局(NASA)的帕克太阳探测器(Parker Solar Probe)已经对我们的恒星有了新的发现。请在美国东部时间12月4日下午3点收看#NASAScience节目，了解这一令人兴奋的新科学。
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
