The World’s Largest Radio Telescope


Credit: NPR/STR/AFP/Getty Images

Pictured above is the  largest radio telescope in the world, which officially opened this past Sunday and is based Pingtang County in southwest China. The Five-hundred-metre Aperture Spherical Telescope, or FAST, is, as the name suggests, 500 meters in diameters, which is 40 percent larger than its predecessor and now runner up, the Arecibo Observatory in Puerto Rico.

FAST will be utilized primarily to observe pulsars, the imploded, highly magnetic cores of old stars that emit intense radiation. Locating and understanding pulsars can yield a lot of important information about the universe. FAST is reportedly sensitive enough to detect radio waves from a pulsar 1,351 light-years away; for a point of reference, a single light-year is 9 trillion kilometers, or 6 trillion miles. So, needless to say, this is an impressive display of technological ingenuity, especially from a country that only relatively recently joined the exclusive (though ever-expanding) club of space exploring nations.

As NPR reports, FAST’s incredible capabilities will be applied to more than just pulsar:

Like radio telescopes in other parts of the world, FAST will study interstellar molecules related to how galaxies evolve. For example, this summer a team using data from the Very Large Array, a collection of radio antennas in the New Mexico desert, picked up what scientists describe as “faint radio emission from atomic hydrogen … in a galaxy nearly 5 billion light-years from Earth.” In the paper describing their findings, the team writes that the “next generation of radio telescopes,” like FAST, will build on their findings about how gases behave in galaxies.

As for FAST’s final use, studying interstellar communication signals, it could be more simply referred to as searching for intelligent extraterrestrial life. “In theory, if there is civilization in outer space, the radio signal it sends will be similar to the signal we can receive when a pulsar … is approaching us,” Qian told Chinese state media, according to the science news website


In an interview with the BBC, the deputy project manager for the new Chinese telescope, Peng Bo, said the project was exciting for Chinese scientists. “For many years, we have had to go outside of China to make observations — and now we have the largest telescope,” he told the BBC.

FAST is only the latest demonstration of China’s scientific prowess in astronomy. In addition to being able to launch its own satellites via domestically designed and build rockets, it is only the third country to send a human into orbit and is also third in independently developing and launching a space station (the second of which was recently and successfully launched). China also has plans for another, more permanent space station by 2020; a manned mission to the Moon, which is to be followed by a permanent lunar base; and  a rover expedition of Mars, to name but a few projects.

China’s contributions towards advancing our understanding of the universe is a welcomed one. As I have noted before, we should set aside nationalist sentiments — however much they are motivating such endeavors — and welcome as many different participants in space exploration as possible, if not for higher ideals of human cooperation than out of a sober acceptance that such efforts require all the resources, capital, and knowledge humanity can pool together.


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