Why Is China's Tiangong-1 Space Station Falling?
China launched a space-station prototype known as Tiangong-1 into low-Earth orbit five years ago. Soon, it may come crashing back down to Earth. Find out why in the video below.
Is China's Space Station Falling?
The Tiangong-1 space station is only five years old. Why is it already coming down?
How To Build A Space Station
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America's First Space Station
Hear about Skylab, the space station made from spare parts.
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