NASA has cancelled its plans for a post-shuttle space vehicle. Until U.

美国航空航天局已经取消了建造后航天飞机时代太空飞行器的计划。

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NASA's newest class of astronauts signed up knowing there'd be no U. S. rockets to launch them into space, at least not in the immediate future.

NASA的最新宇航员被告知并不会有美国的火箭送他们进入太空，至少短期内是这样的。

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"U," in a logarithmic way, means about 30 times louder than the ordinary noise of deep space.

用对数表示，这一信号强度相当于外太空的普通声音的30倍。

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Back from their recent mission, Satcher and Melvin are trying to encourage these black students to think about careers in the U.S.space program.

VOA: standard.2010.02.02

The moon landing was seen as the high point of a U.S.space program fueled by a decade-long space race with the former Soviet Union.

VOA: standard.2009.07.16

Though he favors an end to the shuttle program, he is upset there will be no other U.S.spacecraft to get astronauts to the Space Station.

VOA: standard.2010.04.15

From August 1998 to February 2000, Myers was commander-in-chief of the North American Aerospace Defense Command and U.S. Space Command, and commander of Air Force Space Command, responsible for U.S. defense via space and intercontinental ballistic missile operations.

CNN: Specials

It's serious enough, he said, that the FBI issued an alert about it to the U.S. Space Command, giving U.S. forces warning that the action on the cyber front could affect them, too.

CNN: U.S. Army kick-starts cyberwar machine

Science editor Alan Boyle's blog: NASA and the European Space Agency have signed an agreement calling for the Europeans to provide the service module for the Orion space capsule, the U.S. space agency's crew vehicle for exploration beyond Earth orbit.

MSN: Mars rover survives 'brain transplant' with flying colors