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太空行走,看上去很美

(2008-04-26 12:11:39)
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杂谈

 

太空行走,看上去很美

 

Floating free in the hostile(不友好的) vacuum of space, astronauts push the boundaries of exploration. Join them on an incredible journey as spacecraft Voyager explores the solar system.

 

From planetary(行星的) orbit, the earth and heavens look serene(平静的). But the vacuum of space is a hostile environment, lacking oxygen and permeated(充满/穿透/透过) by radiation(射线). Since the advance of manned space flight(载人太空飞行) in 1960s, human kind has been exploring this inhospitable realm from(王国/领域/地域) the relatively safety of spacecraft.

 

But occasional extravehicular(宇宙飞船外的/飞行器外的/轨道太空舱外的) activities have led astronauts to leave this confine(边界/被限制的一片区域) and explore the unknown. In order for astronauts to survive in space, spacesuits provide a self-contained(自我调控)environment. Their tough material along with heating and cooling elements protect astronauts from extreme temperatures, ranging from around 250 degrees Fahrenheit(华氏=(9/5)*C+32) to minus(负) 250 degrees. The suits are pressurized(密封/增压) with pure oxygen, allowing astronauts to breathe and keep their blood from boiling in the vacuum of space. The first venture outside the spacecraft was made by Soviet cosmonaut Alexey Leonov in 1965, lasting only 12 minutes. This feat(壮举/丰功伟绩) was duplicated(复制/复写/再次创造) in a few months later by an American astronaut Edward White during the Gemini 4 mission. Although these excursions(远足/游览/移动) were meant to test the feasibility of human to exist outside the spacecrafts, spacewalks have become a relatively common part of missions in the space shuttle era.

 

On spacewalks, astronauts have performed vital tasks that could not accomplish from inside the shuttle. They have been able to recover lost satellites, restoring them to their proper orbit. They have serviced orbiting bodies, like replacing the solar panels on the Harbor Space Telescope(哈勃太空望远镜). And they have become the construction crew for the International Space Station(国际空间站). Conducting spacewalks is dangerous, and astronauts work in pairs, tethered(系绳/栓) to the spacecraft for safety. Walking in their spacesuits is not as easy as it seems. The thick pressurized gloves make grasping tools difficult, while the weightlessness(失重) of space creates its own issue. To ensure spacewalk mission a successful, astronauts practise their planned excursions at NASA’s Neutral Buoyancy Laboratory. Immersed in a tank of water, the astronauts neither sink nor float, creating a sensation close to weightlessness. For every hour, a task is scheduled on a mission, up to 10 hours is spent practising underwater. As NASA move forward on the maintenance and construction in the International Space Station, spacewalks will continue to be vital to the process.

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