China Fine-Tunes Earth’s Largest Radio Telescope

Crab Nebula Pulsar


“Some strange signals have been found, but it’s hard to confirm their origins, because these signals do not repeat,” says Li Di, chief scientist at FAST, China’s Five-hundred-meter Aperture Spherical Radio Telescope, the world’s most sensitive listening device. “We look for not only television signals, but also atomic bomb signals. We’ll give full play to our imaginations when processing the signals,” Li states. “It’s a complete exploration, as we don’t know what an alien is like.”

The single-dish radio telescope is made of 4,450 individual panels that scan the sky, detecting the universe’s whispers and shouts. It’s cradled in a natural Earth depression the size of 30 soccer fields. It has more than twice the collecting area of the world’s previous largest radio telescope, the 305-meter dish in Arecibo, Puerto Rico. With construction completed in 2016, FAST has undergone rigorous testing and has one more hurdle before it’s considered fully operational.

“We can receive weaker and more distant radio messages,” said Wu Xiangping, director-general of the Chinese Astronomical Society, “It will help us to search for intelligent life outside of the galaxy and explore the origins of the universe,” he added underscoring the China’s race to be the first nation to discover the existence of an advanced alien civilization.

“We don’t know when earthlings will discover ET. It could be 1,000 years from now, or in our lifetimes. It could be next year, when FAST gets going on the sky surveys,” observes Dan Werthimer, chief scientist for the SETI Research Center at University of California, Berkeley.


China FAST Telescope


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With a dish the size of 30 football fields, China’s new FAST radio telescope, which measures 500 meters in diameter, nicknamed Tianyan, or the Eye of Heaven, can accurately image twice as much the sky as the Arecibo Observatory in Puerto Rico, which had previously been the world’s largest single-dish radio telescope, with double sensitivity and five to 10 times the surveying speed.

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At the end of September, the $171 million USD (1.2 billion CNY) project will undergo the final review process in China, called the National Construction Acceptance.

“We fully expect a successful review at the national level, and then we’ll transition from being a construction project to a full facility,” said Li Di, FAST’s leader of the radio astronomy division of the National Astronomical Observatories of Chinese Academy of Sciences (NAOC). NAOC oversees FAST.

Open to astronomers across the world

“Once we pass this review, FAST becomes an accepted telescope for exploring the Universe,” said Jiang Peng, FAST’s chief engineer and deputy director of FAST Operation and Development Center, NAOC. “Fast has been open to Chinese astronomers since April 2019. After the National Construction Acceptance, it will be open to astronomers across the world.”

For the review to be successful, FAST must meet the specifications initially laid out in the proposed design in 2008, such as the telescope’s sensitivity and performance. NAOC ran an internal review earlier this year, demonstrating that the telescope is as—if not more—sensitive than planned.

The construction of FAST, while solely funded by the Chinese government, involved collaboration with international organizations, including Australia’s Commonwealth Scientific and Industrial Research Organization, but exactly who in the international community will be able to use FAST—and to what extent—is still to be decided. While both Li and Jiang stressed the importance of international collaboration (they have both conducted research using data from radio telescopes in Australia and in Puerto Rico), the decision lies with the Chinese government.

“Our hope for FAST is an open-sky policy, with the goal of advancing the work of humanity,” Li said.

China’s FAST Radio Telescope –“Probes Dark Regions of the Milky Way”

That work could include the detection of pulsars, for example. When a giant star collapses in on itself, it forms a dense neutron star that rotates, flashing a beam of intense radiation every so often. The beam is called a pulsar, and it can’t be visually observed. However, because that flash is a radio signal, scientists can listen for it using a radio telescope like FAST. Once they detect a pulsar, they can use it to identify and measure the behavior of other physical phenomena, such as gravitational waves.

In the few years FAST has been scientifically operational, they’ve already made significant scientific headway, including the discovery of 130 new pulsar candidates, 93 of which were confirmed with other radio telescopes. By comparison, the Arecibo Observatory in Puerto Rico has published the discovery of 200 pulsars since 1968.

“Our goal is to catch up,” Li said. “And eventually have hundreds of new discoveries every year.”

Beyond Pulsars

Beyond pulsars, the researchers are looking for Fast Radio Bursts (FRBs)—the unexplained yet extremely energetic radio signals that are much louder than pulsars despite being much further away. On August 29, FAST detected more than a few dozen bursts from FRB 121102, the first repeating FRB source ever discovered. This source has been constantly monitored by major telescopes around the world since its discovery in 2012. FAST however, was the first telescope to detect so many bursts in such a short amount of time, attesting to its sensitivity and processing power. The FAST science team is now analyzing the data, which may help elucidate the FRB’s origin.

They’re also looking for hydrogen, the most abundant—and suspected oldest—element in the universe.

“We’re going to discover curious emissions,” Jiang said. “These observations could improve our understanding of high-energy physics, star evolution, and galaxy evolution.”

They’ve also organized two major surveys that will take about five years to scan the sky, with another ten years dedicated to analyzing the information collected.

“These programs are straight forward, and account for the research we can plan,” Li said. “But there’s always known unknowns and unknown unknowns that require creativity in planning.”

The surveys will take up about 50% of FAST’s scanning time, during which the researchers will also look for exoplanets with a magnetic field—a crucial component for supporting life, according to Li.

Now that FAST is approaching the final review stage, Li said he is relieved.

“I don’t have any anxiety about it,” Li said. “FAST has exceeded my own expectations. I’m very grateful to our primary driver and founder, Dr. Nan Rendong, and the excellent, hard-working engineering team. We’ve already collected more than enough data for me to work on for the rest of my career. There’s so much we can study.”

Jiang said he is excited, but also feels a responsibility to make FAST even better. In the first submission process of individual researchers interested in pursuing research projects, FAST received 133 proposals with more than 500 associate scientists.

Both Li and Jiang agree that FAST is a product of exponential scientific growth in China since 2000.

“We’re a beneficiary of vast advancement of infrastructure in both science and technology,” Li said. “We are also a contributor. We hope to continue to contribute by making FAST not only a successful construction project, but also something that can be a global landmark in radio astronomy.”

The Extraterrestrial Signal -We May Not Want to Receive

Appearance of an alien civilization might be imminent

The appearance of an alien civilization might be imminent, warned Liu Cixin, China’s foremost science fiction writer and philosopher of first contact on a visit to the FAST telescope, and it might result in our extinction. “Perhaps in ten thousand years, the starry sky that humankind gazes upon will remain empty and silent,” he writes in the postscript to one of his books. “But perhaps tomorrow we’ll wake up and find an alien spaceship the size of the Moon parked in orbit.”

The Daily Galaxy, Max Goldberg, via Chinese Academy of Sciences and The Atlantic

Image at top of the page: composite image of the Crab Nebula features X-rays from Chandra (blue and white), optical data from Hubble (purple), and infrared data from Spitzer (pink). Chandra has repeatedly observed the Crab since the telescope was launched into space in 1999. The Crab Nebula is powered by a quickly spinning, highly magnetized neutron star, a pulsar, which was formed when a massive star ran out of its nuclear fuel and collapsed.

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