瞬态發光现象 (Transient Luminous Events : TLEs) 是由风暴内部和下方的活动所引起在风暴上方的闪光和闪烁。研究员试图从闪电和雷暴中，找出它们的起源和發展以及为何风暴在不同情况下發展出不同的瞬态發光现象。 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
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
