日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

US EUROPE AFRICA ASIA 中文
China / Innovation

New engine passes test and revs up space hopes

By Xin Dingding (China Daily) Updated: 2012-07-30 01:58

Lunar mission will explore moon's surface and bring back samples

A next-generation engine, that will pave the way for lunar exploration, was successfully tested on Sunday.

The engine, with a 120-ton-thrust using liquid oxygen (LOX) and kerosene, will enable the Long March 5 carrier rocket — which is expected to make its maiden voyage in 2014 — to place a 25-ton payload into near-Earth orbit, or place a 14-ton payload into geostationary orbit, experts said.

The tests, which included seeing how the engine would respond to rotational speeds of nearly 20,000 revolutions per minute and temperatures of 3,000 C for

200 seconds, were held in Xi'an, capital of Shaanxi province.

"The successful tests confirm the reliability of China's LOX/kerosene engine,"

said Lai Daichu, test commander.

Tan Yonghua, head of Xi'an Aerospace Propulsion Institute under the China Aerospace Science and

Technology Corp, which developed the engine, said that the single engine currently used by Long March carrier rockets only has a 75-ton thrust, much less than the 120-ton thrust of the new engine.

Luan Xiting, deputy head of the institute, said that the new engine's extra thrust will enable China to assemble a space station and also help with the third stage of the lunar exploration program.

The three stages involve orbit, landing and return.

Earlier reports said that the Chang'e-5 lunar explorer will bring about 2 kg of lunar samples to Earth.

Ouyang Ziyuan, a senior consultant in the lunar exploration program and a member of the Chinese Academy of Sciences, said that Chang'e-5 will be launched atop the Long March 5 carrier rocket from the new space launch center in Wenchang, Hainan province, which is under construction.

The space program is in the second stage, with three lunar exploration spacecraft, Chang'e 2, Chang'e 3 and Chang'e 4.

Ouyang said in a recent e-mail reply to China Daily that China will launch its third lunar explorer, Chang'e 3, next year to land on the moon.

A rover will explore its surroundings.

The landing is expected to be the most challenging part of the mission, he said.

Chang'e 3 will hover about 4 meters above the lunar surface.

Then the engine will cut out, and the Chang'e 3 will drop onto the surface.

Space: Rover can see under the surface

As for the rover, the leading scientist in lunar exploration said it is "China's most advanced robot".

The rover carries a lunar "radar" and while it is operating on the surface it can scan several hundred meters under the surface.

The rover also carries instruments that can detect minerals.

To combat nighttime temperatures, -180 C, scientists have developed nuclear-powered batteries that can help the lander and rover function.

They will conserve energy by "hibernating'' and when the sun rises the solar energy will "wake" the lander and the rover, he said.

Ouyang said the second lunar orbiter, Chang'e 2, has traveled to explore an asteroid.

The asteroid, 4179 Toutatis, is listed as a potentially hazardous object by scientists because it makes frequent Earth fly pasts.

Prior to traveling into deep space, Chang'e 2, launched in October 2010, completed its six-month mission and spent 235 days some 1.5 million km from Earth, where it gathered a large amount of scientific data about solar activity, he said.

It started its quest for the asteroid on April 15, and is expected to observe the asteroid close up, he said.

Contact the writer at xindingding@chinadaily.com.cn

...
主站蜘蛛池模板: 激情视频在线观看免费 | 欧美久久久久久久久久久 | 久久久免费观看 | 久久99精品久久久 | 天天干天天色综合 | 免费观看的av网站 | 探花风韵犹存少妇88av | 欧美精品免费一区二区三区 | 欧美野战 | 日韩欧美大片在线观看 | 欧美一卡| 天天做夜夜操 | 国产精品成人一区二区三区 | www久久| 日韩精品免费在线 | 久久天堂网 | 亚洲第一免费网站 | 日本一二三区在线观看 | 69av在线 | 中文字幕免费高 | 国产另类在线 | 国产一区二区在线播放 | 国产永久| 欧美四区 | 亚色在线视频 | 免费看黄色一级视频 | 在线观看av一区二区 | 日韩精品综合 | 欧美一级性 | 久久小草 | 操插| 天堂av免费在线 | 亚洲天堂影院 | 国产精品爽 | 男人天堂久久 | 一区二区视频观看 | 婷婷色中文网 | 人人爽人人澡 | 日本欧美一区二区三区 | 在线免费亚洲 | 日本中文在线观看 |