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1983年4月7日,美国"挑战者"号航天飞机在太空飞行期间,两名航天员在太空自由自在地飘飞行走了3个多小时.这是人类首次不系绳索自由地在太空行走. 航天员为何能在太空行走呢?原
Twelve men have walked on the moon. And now you can, too. Virtually, that is. Because planetary researchers are enlisting everyday citizens in scientific exploration of the surface of the moon. At the Web site moonzoo.org, you can check out new high-
July 20th 1969 The Eagle has landed. Neil Armstrong and Edwin Buzz Aldrin become the first men to walk on the Moon. The astronauts set foot on the lunar surface during the Apollo XI Mission. That's one small step for man, one giant leap for mankind.A
July 20th 1969 The Eagle has landed. Neil Armstrong and Edwin Buzz Aldrin become the first men to walk on the Moon. The astronauts set foot on the lunar surface during the Apollo XI Mission. That's one small step for man, one giant leap for mankind.A
LOS ANGELES, June 18 (Xinhua) -- Microsoft Corp. unveiled Monday a family of tablets dubbed Surface, built on Windows 8, at an event in Los Angeles. Microsoft Chief Executive Steve Ballmer introduced the company's Surface family of tablets. The devic