The Five-hundred-meter Aperture Spherical Telescope, nicknamed Tianyan, is a radio telescope located in the Dawodang depression, a natural basin in Pingtang County, Guizhou, southwestern China. FAST h
The telescope as seen from above in 2025
FAST under construction
One of six support towers for the feed cabin
Arecibo Telescope
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The Arecibo Telescope was a 305 m spherical reflector radio telescope built into a natural sinkhole at the Arecibo Observatory located near Arecibo, Puerto Rico. A cable-mounted, steerable receiver an
Five-hundred-meter Aperture Spherical Telescope
…scientists will be able to submit applications to China's National Astronomical Observatories online. The basic design of FAST is similar to the former Arecibo Telescope. Both designs had reflectors installed in natural hollows within karst limestone, made of perforated aluminium panels with a movable receiver suspended…
Arecibo Observatory, aerial view, 2012
The Arecibo Radio Telescope as viewed from the observation deck, October 2013
The Arecibo radio telescope in 2019
A detailed view of the beam-steering mechanism. The triangular platform at the top was fixed, and the azimuth arm rotated beneath it. To the right was the Gregorian sub-reflector, and to the left was the remains of the 29-metre-long (96 ft) line feed tuned to 430 MHz (destroyed by Hurricane Maria). Also to the right was the catwalk and part of the rectangular waveguide that brought the 2.5 MW 430 MHz radar transmitter's signal up to the focal region.