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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

Hear about how the space stations of history were made.

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