综合一区欧美国产,99国产麻豆免费精品,九九精品黄色录像,亚洲激情青青草,久久亚洲熟妇熟,中文字幕av在线播放,国产一区二区卡,九九久久国产精品,久久精品视频免费

China / Innovation

Returning lunar orbiter makes skip re-entry

(Xinhua) Updated: 2014-11-01 06:53

BEIJING -- The return module of China's test lunar orbiter made a skip re-entry before plunging into the terrestrial atmosphere for a much anticipated home coming.

If all goes well, it will finally touch down in Siziwang Banner in Inner Mongolia later.

Before its re-entry into Earth, the spacecraft was moving at a velocity of 11.2 kilometers per second. This speed can generate temperatures of more than 1,500 degrees Celsius.

To help the craft slow down, scientists have employed a Soviet-designed method by letting the craft "bounce" off the edge of the Earth's atmosphere, before re-entering again.

The re-entry angle has to be guided so precisely that a 0.2 degrees deviation would render the mission a failure. Experts have previous compared the process to "stone skipping," which helps cut the "braking distance" for the orbiter.

Highlights
Hot Topics
...
1 End --> 大厂| 若羌县| 天柱县| 遵义市| 化德县| 南皮县| 丰原市| 宣武区| 和田县| 二手房| 紫金县| 兴业县| 崇阳县| 曲阳县| 南丰县| 洞口县| 乌审旗| 莒南县| 宁波市| 昌黎县| 黄石市| 永康市| 肥乡县| 佛学| 周口市| 枣庄市| 长垣县| 肇州县| 汾阳市| 贞丰县| 锡林郭勒盟| 广昌县| 崇信县| 乌拉特前旗| 九龙县| 乐陵市| 梅州市| 芒康县| 丹巴县| 分宜县| 内江市|