Measuring Distance in the Solar System | NASA Planetary Sciences | PBS LearningMedia
Measuring Distance in the Solar System | NASA Planetary Sciences | PBS LearningMedia
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 system. The video describes how to use proportions ...
pbslearningmedia.org2015年5月20日
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