Tracking space junk
发布时间 2017-01-16 14:00:02 来源
摘要
You may think the space around our Earth is empty, but there is actually a whole bunch of debris zooming around our planet at more than 17,000 mph. Subscribe: https://goo.gl/G5RXGs
This space junk ranges in size from smaller than a marble to larger than a baseball, and it makes Earth orbit a whole lot more crowded — and dangerous.
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