China is building the world's largest radio telescope to detect life billions of light years away

China's 500-Meter Aperture Spherical Telescope, or FAST, will be the world's biggest radio telescope when it is completed later this year. Its massive size and state-of-the-art design will allow China to detect radio signals from more than 1,000 light-years away. Officials say this is humankind's best chance to find intelligent life in outer space.

Produced by Zach Wasser

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