许多宇航员表示，微重力的生活造成视力模煳。在前往火星探勘之前，研究员尝试找出是什么原因造成视力模煳。 访问 http://science.nasa.gov/ 了解更多信息。 http://www.nasa.gov/station http://www.nasa.gov/mission_pages/station/research/experiments/204.html 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
