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World’s largest radio telescope put into use in Guizhou

When hundreds of engineers and builders began clambering up a jagged hill in southwest China to assemble a giant telescope in a deep, bowl-shaped basin, poor villagers sometimes crept over the sheer slopes to glimpse the country's latest technological wonder.


"We've never seen anything like it, never imagined it," said one of the villagers, Huang Zhangrong, a sun-gnarled 66-year-old carpenter. "It's a big circle, a big iron wok."


The wok is the world's largest single-dish radio telescope, and it officially began operating on Sunday, after more than five years of construction. The "Five-hundred-meter Aperture Spherical Telescope," FAST for short, is intended to project China's scientific ambitions deep into the universe, bringing back dramatic discoveries and honors like Nobel Prizes.


Maybe even messages from aliens.


The telescope, which is in a majestic but impoverished part of Guizhou Province, embodies China's plans to rise as a scientific power. The dish is made of 4,450 intricately positioned triangular panels and has a collecting area of 2.1 million square feet, equal to almost 450 basketball courts. At 1,640 feet in diameter, it will be roughly twice as sensitive as the world's next-biggest single-dish radio telescope, the Arecibo Observatory in Puerto Rico, which is 1,000 feet across.

这架望远镜坐落在贵州省一个壮美但贫困的地区,是中国进入世界科学大国行列计划的化身。"大锅"由4450片精确拼装起来的三角形面板组成,总面积为19.6万平方米,大约相当于450个篮球场。这架望远镜口径为500米,其灵敏度大约是世界上第二大的单口径射电望远镜阿雷西沃望远镜(Arecibo Observatory)的两倍。阿雷西沃望远镜位于波多黎各,口径为302米。

Astronomers will use the Guizhou telescope to map the shape and formation of the universe, relying on its large size and a mobile detector suspended above the dish to explore space more quickly, deeply and thoroughly than smaller telescopes. To ensure the project remains undisturbed, more than 9,000 people are being moved by the government.


But the telescope shows the government in Beijing is also willing to spend heavily to propel China high into the big leagues in research that offers few direct payoffs, apart from knowledge and prestige.


"Astronomy is an ultimate expression of 'pure' science that has little immediate practical benefits," Luis C. Ho, the director of the Kavli Institute for Astronomy and Astrophysics at Peking University, said by email. "It is a luxury that only the most advanced economies enjoy."

"天文学是几乎没有直接实际用途的'纯'科学的一种最高表现形式,"北京大学科维理天文与天体物理研究所所长何子山(Luis C. Ho)在一封电邮中说。"这种奢侈品只有最先进的经济体才能享受。"

China's history of subjugation to the West in previous centuries reinforced the belief that scientific prowess is essential for any modern power. And studying the heavens was, after all, an area where China excelled in ancient times.


"Now we're racing to catch up and want to recreate the glories of our ancestors by reviving our astronomy," Zhang Chengmin, an astrophysicist at the National Astronomical Observatories of the Chinese Academy of Sciences, said in an interview. "China isn't just an economic power; it is also becoming a scientific power."


Astronomy, however, also depends on international cooperation. It also uses foreign equipment. The receiver, a crucial part, is Australian technology. Foreign scientists will be invited to work on research, and many of the telescope's big projects will draw on international collaboration.


The soluble rock that covers this part of Guizhou has dissolved and eroded over eons into jutting hills with natural cavities. The spectacular terrain has also trapped residents in hard, isolated lives, farming corn and honeysuckle in the narrow strips of land among the hills.


But the terrain also offers a nearly ideal environment for a radio telescope. The population is sparse, and the hills are a natural barrier against radio noise and wind that could upset the delicate instruments needed to catch whispers from deep in space.


"We're definitely aiming for innovative results as quickly as possible, unearthing its potential for Nobel Prize-grade discoveries," Di Li, a leading scientist on the FAST project, told Xinhua, the state news agency, last year.


The telescope is part of an array of projects to raise China's standing as a scientific power through big, expensive feats of scientific exploration.


The space program aims to send an astronaut to the moon by 2025 or later and to land an unmanned vehicle on Mars in 2020. Chinese scientists plan to build the world's biggest particle accelerator. And there may be more radio telescopes, including in Tibet.


Using the new reach of the telescope in Guizhou, astronomers hope to better measure the distribution of neutral hydrogen atoms, like a telltale cosmic dust.


"Previous research could only tell us that the universe is expanding," Zhang Tongjie, a professor of cosmology at Beijing Normal University who plans to use the telescope, said in an interview.


If the telescope can be used to survey electromagnetic radiation from neutral hydrogen, he said, Chinese scientists would be well positioned to gain a much more accurate grasp of how fast the universe is expanding. "That would be very significant," he said.


Astronomers also hope to use the telescope to locate thousands more pulsars, the highly magnetized neutron stars that rotate, creating a metronome-like pulse that is a boon to measurements. By better measuring pulsars, and more of them, the telescope could open up a new way to explore the long-elusive gravitational waves predicted by Einstein's general theory of relativity.


Only early this year, an international team of scientists announcedthat they had captured evidence of gravitational waves. But the pulsar research would offer another way to make progress, perhaps confirming and refining that discovery.


"This telescope offers the first time that China will have an unsurpassed opportunity to be at the international forefront of deep space exploration," said Mr. Zhang, the astrophysicist.


But astronomers said it could take years before the telescope in Guizhou starts making breakthroughs. It could take a year or two for the scientists and technicians to tweak and debug the complex equipment so that the telescope can work at full strength, they said.


Source: New York Times


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