China's giant, alien-hunting radio telescope is finishing its testing-and-commissioning phase, which has occurred over the past three years.

Located in southern China's Guizhou province, the Five-hundred-meter Aperture Spherical Telescope (FAST) began these trial operations in September 2016.

Scientists are using FAST — the world's largest single-dish radio telescope — for a variety of tasks, including to search for extraterrestrial intelligence .

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The Five-hundred-meter Aperture Spherical Telescope (FAST) in southwest China's Guizhou Province. (Image credit: NAO/FAST)

China Central Television (CCTV) reports that, so far, FAST has detected and identified 99 rapidly spinning neutron stars known as pulsars , more than 30 of which are especially fast-rotating millisecond pulsars.

The search for extraterrestrial life and other scientific targets is also underway.

"In the process of observing signals from celestial bodies, we also collect signals that might be emitted by humans or extraterrestrial intelligence," Zhu Ming, director of the scientific observation and data division at the FAST operations and development center, explained in a recent CCTV video .

"However, this is a huge amount of work, since most signals we see — 99% of them — are various noises, so we need to take our time to identify the signals we want in the noises," Zhu said.

The FAST team recently organized a user training session, bringing together more than 100 astronomers from across China to discuss their experiences and discoveries during the trial operation of the big dish.

Li Kejia, a researcher from the Kavli Institute for Astronomy and Astrophysics at Peking University, explained that FAST is now mainly used to measure the performance of a pulsar timing system, to directly detect gravitational waves .

"The sensitivity of FAST is very high, so the accuracy of the data measured is very good," Li told CCTV. "FAST has a promising future in terms of gravitational wave detection."

Researchers using FAST have increased the facility's observation modes from three to more than 10. Research and development of new receiving equipment are also underway.

"I hope that in the next three years, we can further improve the reliability of FAST and increase its effective observation time to 50%," Jiang Peng, chief engineer of the FAST project, said in the CCTV video. "Since it's already about three times as sensitive as the second-largest telescope in the world, a 50% effective observation time is already very remarkable."

Leonard David is author of the recently released book, "Moon Rush: The New Space Race" published by National Geographic in May 2019. A longtime writer for Space.com, David has been reporting on the space industry for more than five decades. Follow us on Twitter @Spacedotcom or Facebook.