www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

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

China builds world-class astronomical base in Tibet

Xinhua | Updated: 2017-09-21 13:57

BEIJING -- With its thin air and clear sky, Ngari Prefecture is an ideal place for astronomers to gaze into the remote universe.

Chinese scientists are building a world-class observatory base at an altitude above 5,000 meters at Ngari, in the west of China's Tibet autonomous region.

They have launched a project to detect primary gravitational waves there. They also plan to conduct high-precision detection of cosmic rays and build China's largest optical telescope.

Xue Suijian, deputy director of the National Astronomical Observatories of China (NAOC), says astronomical observation requires clarity, transparency, tranquility and aridity of the atmosphere. A suitable site for multiple wave-length observation is a rare resource.

It's widely believed that the world's best astronomical observatories are located on Mauna Kea mountain, on Hawaii's Big Island, and in the desert in northern Chile. These two places, in the northern and southern hemispheres respectively, are home to more than 90 percent of the world's large astronomical facilities.

However, due to objections from native Hawaiians, the world's largest optical telescope, the Thirty Meter Telescope (TMT), might be the last astronomical project to be built on Mauna Kea, says Xue.

Scientists are eager to find another good observatory base in the northern hemisphere.

Xue said NAOC began looking for a suitable site in western China in 2004, focusing on a ridge ranging from 5,000 meters to 6,200 meters above sea level in Ngari.

Now the Ngari Observatory is starting to take shape. Chinese universities and institutes, as well as research organizations from Japan and the United States, are joining NAOC with plans for projects there.

China's largest optical telescope, the 12-meter telescope, is expected to be built at the site. The project is included in China's large-scale sci-tech infrastructure plan for 2016 to 2020, says Xue.

Xue says NAOC will also cooperate with Tibet University and Ngari prefecture government to launch a project for the high-precision detection of cosmic rays above the 50 TeV energy region. Scientists from the University of Tokyo have pledged equipment worth tens of millions of yuan for the project.

Scientists are also building at Ngari the world's highest station to observe primary gravitational waves, dubbed "the first cry of the cosmos after the Big Bang."

Zhang Xinmin, lead scientist of the project with the Institute of High Energy Physics under the Chinese Academy of Sciences (CAS), says detection of primary gravitational waves is of great significance to studying the origin and evolution of the universe.

Although the first detection of gravitational waves was announced on February 2016, no primary gravitational waves have been detected so far. But they remain a hot topic in international academic circles.

According to cosmic inflation theory, the universe expanded rapidly in a very short period after the Big Bang, and caused ripples in space-time. The primary gravitational waves generated by cosmic inflation should have left traces in the cosmic microwave background (CMB).

In May 2014, Zhang Xinmin proposed a CMB detection experiment in Ngari, arguing that as primary gravitational waves were very weak, the detection site should have thin air, and the drier the better.

Ngari is one of just four places in the world regarded as the best sites for primary gravitational wave detection, alongside Antarctica, Chile's Atacama Desert and Greenland.

Zhang had considered China's Kunlun Station in Antarctica to conduct the experiment, but the infrastructure there was insufficient.

The primary gravitational wave detection experiment, a joint China-US project, was launched in late 2016.

The first stage of the project will see a telescope built at a site 5,250 meters above sea level to realize the first measurement of primary gravitational waves in the northern hemisphere. The telescope is expected to be installed at the end of 2019 and operational in 2020.

Scientists then plan to build a more sensitive telescope at a higher site to realize more accurate measurement of primary gravitational waves.

Scientists at the Institute of High Energy Physics of CAS and Stanford University are cooperating to design the telescope, which will be 2.7 times more powerful than the BICEP 3 telescope in Antarctica, says Zhang.

Xue says China should utilize the unique geographical advantage of the "Roof of the World." The series of projects, scheduled to run until 2030, could help promote Tibet's social and economic development.

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: 亚洲综合国产精品 | 国产精自产拍久久久久久蜜 | 97在线视频免费观看 | 男人性天堂 | 91精品国产免费久久久久久 | 欧美不卡视频在线观看 | 成人一级黄色毛片 | 欧美一级高清视频在线播放 | 九九精彩视频在线观看视频 | 国产成人看片免费视频观看 | 成年网站免费 | 91成人免费在线视频 | 欧美一级爆毛片 | 亚洲午夜成激人情在线影院 | 热99re久久精品这里都是免费 | 免费v片视频在线观看视频 免费v片在线观看 | 国产一区二区在免费观看 | 亚洲一级毛片视频 | 亚洲欧洲日产v特级毛片 | 国产在线不卡视频 | 草草影音 | 国产玖玖在线观看 | 欧美一级别 | 99r8这是只有精品视频9 | 精品国产一区二区三区www | 精品伊人久久久久网站 | 国产高清一区二区三区 | 国产成人午夜极速观看 | 不卡无毒免费毛片视频观看 | 欧美精品成人一区二区在线观看 | 欧美成人免费tv在线播放 | 国产三级借妻 | 日本aaaa片毛片免费 | 亚洲欧美日本韩国综合在线观看 | 亚洲精品国产美女在线观看 | a级在线观看视频 | 欧美成人亚洲高清在线观看 | 精品在线观看一区 | 欧美理论大片清免费观看 | 在线国产一区二区 | 亚洲 欧美 中文字幕 |