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

China's unmanned lunar orbiter returns home

(Xinhua) Updated: 2014-11-01 09:18

China's unmanned lunar orbiter returns home

Researchers retrieve the return capsule of China's unmanned lunar orbiter in the central region of North China's Inner Mongolia autonomous region, Nov 1, 2014. [Photo/xinhuanet.com]

BEIJING -- China succeeded Saturday in the world's first mission to the Moon and back in some 40 years, becoming the third nation to do so after the former Soviet Union and the United States.

The test lunar orbiter, nicknamed "Xiaofei" on Chinese social networks, landed in Siziwang Banner of China's Inner Mongolia Autonomous Region early Saturday morning.

Search teams have already recovered the orbiter at the designated landing area, about 500 kilometers away from Beijing.

The last documented mission of this kind was by the Soviet Union in the 1970s.

Launched Friday last week, the orbiter traversed 840,000 kilometers on its eight-day mission that saw it round the far side of the Moon and take some incredible pictures of Earth and Moon together.

The re-entry process began at around 6:13 a.m. Saturday morning, with the orbiter approaching Earth at a velocity of about 11.2 kilometers per second.

The high speed led to hefty friction between the orbiter and air and high temperatures on the craft's exterior, generating an ion sheath that cut off contact between ground command and the orbiter.

To help it slow down, the craft is designed to "bounce" off the edge of the atmosphere, before re-entering again. The process has been compared to a stone skipping across water, and can shorten the "braking distance" for the orbiter, according to Zhou Jianliang, chief engineer with the Beijing Aerospace Command and Control Center.

"Really, this is like braking a car," said Zhou, "The faster you drive, the longer the distance you need to bring the car to a complete stop."

The "bounce" was one of the biggest challenges of the mission, because the craft must enter the atmosphere at a very precise angle. An error of 0.2 degrees would have rendered the mission a failure.

Wu Yanhua, vice director of China's State Administration of Science, Technology and Industry for National Defense, said the successful test mission has gathered a lot of experimental data and laid a solid foundation for future missions.`

Paving way for new probe

The eight-day program is a test run for the final chapter of China's three-step--orbiting, landing and finally returning--lunar program.

"Xiaofei" is obtaining data and validating re-entry technology such as the heat shield and trajectory design for a future landing on the moon by Chang'e-5.

Previous Page 1 2 3 4 5 6 Next Page

Highlights
Hot Topics
...
1 End --> 主站蜘蛛池模板: aaa国产 | 开心激情网站 | 黄色在线一区 | 999国产精品视频免费 | 男人的天堂中文字幕 | 欧美三级在线 | 国产精品久久久久久久久久久久久 | 精品久久国产视频 | 欧美a区 | 久久在线精品视频 | 精品成人免费一区二区在线播放 | 亚洲视频在线一区二区 | 黄色一级网站 | 成人免费视频国产免费网站 | 好吊日av | 伊人久久一区二区三区 | 韩日三级视频 | 欧美日韩中文在线 | 国产精品视频看看 | 久久久久久久久国产精品 | 中文字幕免费视频观看 | 91在线网 | 激情视频久久 | 欧美日韩一级在线 | 国产一区观看 | 日韩精品久久久久久免费 | 三级在线播放 | 三级经典在线 | 久久久久久久久久久国产精品 | 男人的天堂成人 | 日韩综合激情 | 牛牛澡牛牛爽一区二区 | 免费成人福利视频 | 九九自拍视频 | 欧美国产日韩在线观看 | 成人免费观看网站 | 午夜羞羞网站 | 精品国产一区二区三 | 国产日产亚洲系列最新 | 国产成人精品一区二区三区网站观看 | 久久久久久穴 |