World's Biggest radio telescope FAST


FAST stands for Five-hundred meter Aperture Spherical Telescope. FAST's nickname is Tianyan, which means "Eye of the Sky" or "Eye of Heaven". It's built in a natural depression in Guizhou, Southwest China.

Among other things, its scientific goals are to study pulsars. FAST has already discovered two of those, in August 2017.
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FAST's name is not exactly accurate. Though it does have a 500 meter (1,640 foot) diameter, only 300 meters of it is used at any one time. The telescope is active and can change so that one 300 meter segment is focused on the receiver.

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