[00:06.59]Hubble was launched aboard the Space Shuttle Discovery in 1990.
[00:11.40]Mission Control saw something it hadn't expected: fuzzy images.
[00:16.60]Hubble Space Telescope Program Manager Douglas Broome
[00:20.19] delivered the troubling news:
[00:22.69]"The conclusion we've come to is that a significant spherical aberration
[00:27.30] appears to be present in the optics, in the optical telescope system optics."
[00:31.80]In other words - the outer edge of Hubble's primary mirror
[00:35.59]had been ground too flat,
[00:37.39] off by roughly one-fiftieth the thickness of a human hair.
[00:42.09]In 1993, a shuttle mission carried a replacement camera, WFPC2
[00:47.59]and an instrument with corrective lenses called COSTAR
[00:51.09] for astronauts to install on the telescope.
[00:53.69]"The COSTAR inserted mirrors into the optical beam
[00:57.39] that corrected the light for all the other instruments,"
[01:00.39]said National Air and Space Museum senior curator David Devorkin.
[01:04.70]The fix proved that very difficult and very complicated operations
[01:08.70]could be undertaken by shuttle astronauts.
[01:11.20]"The whole idea of living and working in space
[01:13.29] is doing useful stuff and this certainly was useful."
[01:16.89] "On the astronomical side and you might say on the technical side,
[01:21.09]it represents how fast telescopes are improving
[01:25.00]because Hubble was only repaired once,
[01:28.39]but it was upgraded four times."
[01:31.29]COSTAR and WFPC2 were replaced in 2009
[01:35.00]and are now on exhibit in the museum.
[01:37.50]Hubble images have become better and sharper over time.
[01:51.59]And the powerful space telescope has led to other important breakthroughs.
[01:57.50]"… understanding star forming regions,
[01:59.89]how stars form out of gas and dust,
[02:02.00]and now the ability of the Hubble to see deeply into the infrared,
[02:06.50]far deeper than before
[02:08.40] has shown us the processes inside these interstellar clouds
[02:12.50] that literally are forming the stars
[02:15.40] and their interaction with the dust and gas around them."
[02:18.60]As Hubble nears the end of its journey in space,
[02:21.50]the telescope has paved the way for its replacement.
[02:25.30]The James Webb Space Telescope -
[02:27.30]with an expected launch date in 2018 -
[02:30.30]will probe even farther beyond the spectrum of light
[02:33.30]with a primary mirror five times larger than Hubble.
[02:37.20]"The James Webb is optimized for infrared
[02:40.30]because all of the most amazing discoveries about galaxy formation,
[02:44.30]star formation and the kind of stuff
[02:47.50]that astronomers want to know is in the infrared."
[02:51.00]No more service missions are scheduled for repairs or upgrades.
詞匯解析
remarkable
難度：3星常用詞匯，屬常用6000詞
英漢解釋
adj.非凡的；值得注意的；顯著的；異常的；卓越的
參考例句
用作形容詞 (adj.)
He showed remarkable courage when he faced the danger.
他在面對危險的時候表現(xiàn)出非凡的勇氣。
Remarkable economic results have been achieved by the company.
那個公司取得了顯著的經(jīng)濟效益。
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optical
難度：3星常用詞匯，屬常用6000詞
英漢解釋
adj.視覺的；光學的
參考例句
用作形容詞 (adj.)
The optical system of the eye stimulate cell of the retina.
眼睛的視覺系統(tǒng)刺激視網(wǎng)膜內(nèi)的細胞。
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thickness
難度：2星擴展詞匯，屬常用10000詞
英漢解釋
n.厚度；濃度；層
參考例句
用作名詞 (n.)
The results show that certain thickness of the base metal and the regime of heat treatment will increase the peak hydrogen concentration and promote the tendency of disbonding.
結(jié)果顯示，一定的母材厚度和焊后熱處理條件，使熔合線附近氫濃度峰值提高，從而使氫剝離傾向增大。
I wrapped the ice cream in three thicknesses of newspaper to keep it cool.
我用三層報紙包裹冰淇淋使其不致變熱融化。
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shuttle
難度：3星常用詞匯，屬常用6000詞
英漢解釋
n.梭子；穿梭；往返移動之物；航天飛機
v.往返運送；穿梭移動
參考例句
用作名詞 (n.)
The shuttle flies back and forth on the loom.
織布機上梭子來回飛動。
用作動詞 (v.)
We shuttled the passengers to the city center by helicopter.
我們來來回回地用直升機把旅客運送到市中心。
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mission
難度：4星核心詞匯，屬常用3000詞
英漢解釋
n.使命；代表團；任務(wù)；布道
參考例句
用作名詞 (n.)
A Chinese trade mission has been dispatched to Japan.
一個中國貿(mào)易代表團已被派往日本。
He has been on confidential missions to Berlin.
他前往柏林執(zhí)行秘密任務(wù)。
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stuff
難度：4星核心詞匯，屬常用3000詞
英漢解釋
n.東西；原料；材料
n.素質(zhì)；本質(zhì)；廢物；無用的想法；廢話，蠢話
vt.塞滿；填滿
參考例句
用作名詞 (n.)
Get rid of that stuff in the garage.
把車庫里那些沒有用的東西處理掉。
用作及物動詞 (vt.)
He stuffed the suitcase with his clothes.
他把衣服塞滿手提箱。
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technical
難度：4星核心詞匯，屬常用3000詞
英漢解釋
adj.技術(shù)的；專業(yè)的；工藝的
參考例句
用作形容詞 (adj.)
On technical matters, I defer to the experts.
在技術(shù)問題上，我遵從專家的意見。
It is special craft art technical skill in Yunnan.
這是云南獨特的工藝美術(shù)技藝。
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calculate
難度：4星核心詞匯，屬常用3000詞
英漢解釋
v.計算；估計；考慮；推測；計劃；指望
參考例句
用作動詞 (v.)
Scientists have calculated that the world's population will double by the end of the century.
科學家已推算出世界人口在本世紀末將要增加一倍。
We cannot calculate on his help.
我們不能指望他的幫助。
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