三级aa视频在线观看-三级国产-三级国产精品一区二区-三级国产三级在线-三级国产在线

USEUROPEAFRICAASIA 中文雙語Fran?ais
China
Home / China / Innovation

Finance sought for radio telescope in Antarctica

By Cheng Yingqi | China Daily | Updated: 2016-12-14 07:31

Finance sought for radio telescope in Antarctica

Diagram of a radio telescope that astronomers proposed to be built in Antarctica.

Astronomers hope to observe electromagnetic waves from the location known as Dome A

Chinese astronomers are applying for government funding to begin construction of a radio telescope in Antarctica that could help solve the mysteries behind stars and galaxies.

The proposed facility, to be built on a giant ice cap known as Dome A, has been designed to observe terahertz, a band of electromagnetic waves normally too weak for ground-based stations to receive.

"The high altitude and low temperatures at Dome A make it possible for astronomical observation of terahertz," said Shi Shengcai, a researcher at Purple Mountain Observatory, a facility in Nanjing affiliated with the Chinese Academy of Sciences. "The thick atmospheric layers in most other places absorb too much of the signal."

Temperatures at Dome A can fall as low as -80 C. The extreme environment is perfect for scientific experiments, but few were able to make use of it before the Polar Research Institute of China and its international partners set up the Plateau Observatory, or Plato, in 2008.

Shi's academy and the State Oceanic Administration now are applying for funding from the National Development and Reform Commission to build a 5-meter terahertz telescope at Dome A. If approved, construction will start soon and last up to five years.

The cost of the project has not been released. However, once complete, the facility is expected to be the only one of its kind on Earth.

The project has been boosted by analysis of multiple terahertz frequencies observed by equipment placed at Dome A over 19 months in 2010 and 2011. A paper on the observation data was published on Tuesday by the science journal Nature Astronomy.

"The initial success is encouraging," Shi said, adding that preliminary research for the terahertz telescope has been completed.

Electromagnetic radiation travels through space in the form of light waves and is distinguished by wavelength. In order of decreasing wavelength, there are radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays.

The wavelength of terahertz, which lies between microwaves and infrared, is important in observing the features of the dominant forms of carbon and thus could answer astronomical mysteries related to the formation and evolution of stars and galaxies.

"Terahertz have been a fruitful energy band for astronomical observation, although in the past, scientists had to observe the band using space or airborne telescopes," said Zhang Qizhou of the Smithsonian Astrophysical Observatory in the United States.

The European Space Agency's Herschel, the first space observatory to spot a broadband optical spectrum that included terahertz, was retired in 2013 after providing exciting results in many areas of astronomy.

NASA's Stratospheric Observatory for Infrared Astronomy, a modified Boeing 747SP aircraft carrying a 2.5-meter telescope, can be used for observation for only about 10 hours during each flight.

In 2008, international partners including China, the US and Australia set up a radiometer in preparation for a High Elevation Antarctic Terahertz Telescope. However, that project was later suspended.

"Astronomers thought it (observing terahertz) couldn't be done on Earth," Zhang said. "In fact, a ground-based observatory has obvious advantages, as it can hold a larger telescope and is much more flexible because astronomers can go there - it's difficult, but it's reachable - to maintain and upgrade the telescope."

Hu Zhongwen from the National Astronomical Observatories, also affiliated with the CAS, said Chinese scientists have accumulated experience in deploying and operating sophisticated equipment in the extreme conditions at Dome A.

"The harsh weather poses severe challenges to equipment there, and it wasn't possible to send people to check and fix it repeatedly, so we developed some measures to ensure the equipment is better suited to the environment," Hu said.

"It would be risky to build large scientific facilities in the polar environment without any experience. Experiments with the spectrometer have gotten us prepared for a larger project."

Editor's picks
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 中文一区二区视频 | pans国产大尺度私密拍摄视频 | 福利综合网 | 国产亚洲精品第一区在线观看 | 亚洲妇熟xxxxx妇色黄 | 黄色网页在线免费观看 | 在线人成精品免费视频 | 在线亚洲国产精品区 | 成人午夜做爰视频免费看 | 毛片一区二区三区 | 国产成人精品日本亚洲网址 | 香蕉成人啪国产精品视频综合网 | 激情三级hd中文字幕 | 床上毛片 | 青青草97国产精品免费观看 | 欧美h版无删完整大片 | 91国在线啪精品一区 | 丁香激情网| 一级毛片在线观看免费 | 黄色网址视频在线播放 | 永久免费在线视频 | 嗯~啊~哦~别~别停~啊黑人 | 国产一级理论免费版 | 久久91综合国产91久久精品 | 香蕉tv亚洲专区在线观看 | 欧美夜夜精品一级爽 | 国产igao激情在线观看 | 成人影片在线播放 | 中文字幕在线播放一区 | 国产九九免费视频网站 | 国产精品一区二区久久 | 国产精品aaa | 一级做片爱性视频免费 | 91老女人| 69成人免费视频 | 久久精品乱子伦免费 | 国产精品久久不卡日韩美女 | 国产精品久久久久久福利漫画 | 国产免费资源高清小视频在线观看 | 直接看的黄色网址 | 在线免费一区二区 |