单词:free-space radar equation
单词:free-space radar equation 相关文章
So in 1994 a small unmanned orbiter Clementine 于是柯蕾曼堤号无人太空船 was sent back to the moon, 在1994年再度前往月球 the first spacecraft to make the journey in more than 20 years. 这是20多年来首度展开这趟旅程的太空
Water Is Buried Beneath Mars Surface, Study Says A huge lake of salty water appears to be buried deep in Mars, scientists reported this week. The presence of water raises the chances of finding life on the red planet. The discovery is based on observ
Scientists Deliberate Cleaning Space Junk WASHINGTON Everything that we launch into an orbit around the earth eventually becomes space debris. Scientists say the increasing number of unusable objects circling our planet is threatening functioning sat
[00:02.70]Unit 20 New Frontiers [00:06.15]Lesson 3 Scientific Breakthroughs [00:10.11]PIONEERS OF SCIENCE [00:12.16]In the summer of 1905, [00:14.40]a young man was sitting at home [00:15.97]after a day's work. [00:18.04]While rocking his one-year-ol
You Do the Math Hello and welcome to Words and Their Stories from VOA Learning English. On this program we explain how to use common expressions in American English. We also explore the origins of these expressions. Where do they come from? Today we
On the day that President Obama once again said the Assad regime's use of chemical weapons would be a game changer after a week of weighing U.S. military action or directly supporting opposition. A U.S.ally Israel, has apparently hit Syria from the a
Six, five, four, three, two, one, zero India launched its first mission to the moon on Wednesday, rocketing the Chandrayaan-1 into the dawn sky for a 2-year mission to redraw maps of the lunar surface. Dear colleagues and friends, its a historic mom
Broadcast: Feb 01, 2003 The U.S. Space Shuttle Columbia broke apart in mid-air Saturday minutes before it was to return to Earth. The U.S. space agency, 1) NASA, says none of the seven astronauts aboa
VOICE ONE: Im Steve Ember. VOICE TWO: And Im Faith Lapidus with EXPLORATIONS in VOA Special English. This week, we tell about a growing threat to airplanes around the world. And we hear about objects in space that are threatening satellites and the
By Al Pessin Washington 28 September 2006 US Air Force Gen. Kevin Chilton The head of the U.S. Air Force Space Command says he is working to improve the military's sensor system to ensure that no one can threaten crucial space-based assets. The comm
ESA Spacecraft to Land on a Comet 欧洲航天局探测器登录彗星 After a long flight through deep space, a European Space Agency probe is finally approaching its target - a comet millions of kilometers away from earth. Scientists say the missio
In Africa, New Technologies Help Teach Women to Read 在非洲,新技术帮助教女人阅读 More Africans are communicating via text, social media and email. In Senegal, literacy experts are using the new technologies to motivate and teach women
[0:0]entertain招待,款待 [0:11.2108]entertainment enthusiasm entitle entry娱乐,文娱节目 热情,热心 给...权利,给...资格 参赛的人 [1:7.0247]environment envy equality equation环境,周围状况 忌妒,羡慕 相等,相同 议程,等式 [1:59.5258]equivalent era erect err
Every year satellites are damaged or destroyed by objects orbiting the Earth's atmosphere. An Australian company is now using the latest laser technology to track these objects in order to reduce cosmic damage. Li Dong has the details. Even in space,
Six, five, four, three, two, one, zero India launched its first mission to the moon on Wednesday, rocketing the Chandrayaan-1 into the dawn sky for a 2-year mission to redraw maps of the lunar surface. Dear colleagues and friends, its a historic mome
Heset out to investigate a hundred-year-old theory that said asteroids werepowered by the Sun itself. It was called the Yarkovsky effect. The Yarkovskyeffect is a very small acceleration and acts on asteroids and what it is is ifyou take a model, the
By Lisa Schlein Geneva 12 February 2008 Russia is warning of a new arms race if a treaty banning the deployment of weapons in outer space is not achieved. Russia and China have jointly presented a draft treaty to the U.N. Conference on Disarmament th
The rule is what goes up must come down, but the trouble is nobody knows exactly where the six-ton NASA satellite will crash land. This white blob is the UARS probe as it spins out of control during its descent, the footage was taken by an astronomer
音乐咖啡厅:Dru Hill - Away 相关介绍:Dru Hill是一只来自美国的组合,在90年代后期最受欢迎,其演奏曲目包括蓝调,灵歌,福音音乐。1992年成立于马里兰州的巴尔的摩,自此一直活跃于乐坛,以
A Sci-Fi Writer: Arthur Clarke 科幻作家:阿瑟克拉克 Born in western England, on December 16th, 1917, the son of a farmer, Arthur Clarke became addicted to science fiction after buying his first copies of the magazine Amazing Stories. He beg