http://news.xinhuanet.com/world/2009-03/27/content_11079616.htm
“發現”號離站返回
2009年03月27日 07:17:31 來源:新華網
美國“發現”號航天飛機於美國東部時間25日下午與國際空間站分離,開始返回地球。
分離之際,國際空間站第18長期考察組指令長邁克·芬克大聲說:“祝一路平安!歡迎再來!”
路透社報道,“發現”號指令長李·阿爾尚博與飛行員托尼·安東內利於美國東部時間25日下午3時53分(北京時間26日3時53分)點燃航天飛機的操縱噴射裝置,推動重達100噸的航天飛機與空間站分離。
美聯社報道,分離後,“發現”號繞空間站飛行一圈,主要是給空間站新貌拍攝圖片。但由於繞飛過程中沒有電視信號,美國航空局地面控制中心需“稍等片刻”才能看到圖片。
“發現”號與空間站分離前,宇航員們彼此擁抱、話別。芬克對“發現”號機組宇航員說:“有你們來到這裡,真的很棒。你們使得空間站比以前更好,給我們帶來更多電力,令空間站更對稱……”
“發現”號15日升空,17日與空間站對接。在為期8天的對接期間,“發現”號機組宇航員共進行了3次太空行走,完成空間站相關組件的安裝工作,包括安裝並展開空間站第四組也是最後一組太陽能電池板。
“發現”號及7名宇航員預計於28日返回地面,降落美國肯尼迪航天中心。(新華社專電)
(責任編輯: 劉暢 )
http://nz.news.yahoo.com/a/-/technology/5457008/space-shuttle-crew-rechecks-ship-for-damage/
Space shuttle crew rechecks ship for damage
March 27, 2009, 7:17 am
CAPE CANAVERAL, Florida (Reuters) - The shuttle Discovery astronauts used a robot arm and laser scanners to recheck their ship's heat shield for damage on Thursday in preparation for their return to Earth on Saturday.
The shuttle has been in orbit since March 15 on a mission to outfit the International Space Station with its last pair of solar panel wings. It departed the orbital outpost on Wednesday.
The crew used a laser system mounted on the end of a boom on the shuttle's 50-foot (15-meter) robot arm to inspect Discovery's wings and nose, which can get as hot as 3,000 degrees Fahrenheit (1,650 degrees Celsius) as the ship glides through the atmosphere for landing.
The inspections are part of all shuttle missions since the 2003 Columbia accident, which killed seven astronauts. That shuttle was damaged during launch by a piece of falling debris and broke apart as it headed toward landing in Florida 16 days later.
An initial inspection the day after Discovery's launch showed no signs of damage from debris impacts. NASA wants the second inspection to check for impacts from orbital debris, which is becoming a growing problem in Earth orbit.
During Discovery's eight-day stay at the station, NASA had the crews maneuver to avoid coming too close to a fragment from a Chinese spacecraft.
Earlier this month, the station crew had to duck into their Soyuz lifeboat for a few minutes while another piece of debris, with an orbit too variable for immediate, accurate tracking by ground radars, passed by.
"We have had a couple of these in the last couple of weeks, but as far as I know, it is coincidental," Discovery commander Lee Archambault said during an inflight interview.
The issue of orbital debris has been more publicized since a crash last month between a U.S. commercial communications satellite and a defunct Russian spacecraft. Two years ago, China also purposely destroyed one of its satellites to test a missile. It was widely condemned.
Even tiny pieces of debris can have deadly consequences because they are moving at speeds of about 17,500 mph, which is how fast something needs to travel in order to be in orbit around Earth.
Shuttles have returned from space with window cracks from flecks of flying paint. In orbit, something as small as a grain of sand can impact with the power of a bowling ball moving at 100 mph.
Engineers will analyze the images relayed by the Discovery crew before clearing the ship for re-entry and landing.
Touchdown is scheduled for 1:38 p.m. EDT Saturday at the Kennedy Space Center in Florida.
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