The world's largest single-aperture telescope is completed in China
The Five-hundred-metre Aperture Spherical radio Telescope (FAST) is a major new astronomical observatory built in Guizhou province, southwest China. Constructed between March 2011 and September 2016,* it becomes the largest single-aperture telescope in the world, half a kilometre wide and featuring a collecting area of 2.1 million sq ft (196,000 sq m). This dwarfs the next largest – the Arecibo Observatory in Puerto Rico – which had held the title since 1963.*The dish itself sits within a natural depression and is unable to move, due to its enormous size. However, the surface shape is changeable and the feed cabin (where radio waves are focused) can be moved around. This provides a viewing angle of up to 40° from the vertical.
FAST is able to gaze three times further into space and survey the skies ten times faster than Arecibo. Its primary roles include mapping the neutral hydrogen within the Milky Way at very high resolution, tripling the number of known pulsars from 2,000 to 6,000, and listening for possible signals from alien civilisations at distances of up to 1,000 light years; far more stars can be monitored than in previous surveys. FAST is the latest in a whole series of massive new telescopes being built around the world in the early 21st century, heralding a new era of astronomy.
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