日韩精品久久一区二区三区_亚洲色图p_亚洲综合在线最大成人_国产中出在线观看_日韩免费_亚洲综合在线一区

 
 
您現在的位置: Language Tips > BBC > Take Away English

Our eyes to the Universe 人類觀測宇宙的“眼睛”

 

Vocabulary: space 太空

Our eyes to the Universe 人類觀測宇宙的“眼睛”

Hubble’s orbit is 370 miles above the Earth

收聽與下載

The Space Telescope Hubble has changed the way we look at the universe. In its 25 years of activity it has captured over a million images of deep space.

The Hubble drifts 370 miles above the Earth, in a much better position to observe the cosmos than ground-based telescopes. It avoids the distortions of the atmosphere, and takes extremely high-resolution images with very little background light.

NASA Administrator Charlie Bolden says: "Even the most optimistic person to whom you could have spoken back in 1990 couldn't have predicted the degree to which Hubble would rewrite our astrophysics and planetary science textbooks."

Before the telescope was launched, there were doubts about the age of the universe. Some said it was 10 billion years old and others thought 20 billion. Now, thanks to Hubble's observation of stars, we know it's 13.8 billion years old. The telescope has also helped to reveal the accelerating expansion of the universe and provided evidence of the existence of massive black holes at the centre of galaxies.

But this hasn't been an easy journey. Named after the US astronomer Edwin Hubble, it left the Earth's surface on the back of the space shuttle Discovery. But the initial images were fuzzy and crucial repairs were made to its mirror in 1993.

Now Hubble is probing objects up to 50 times fainter than before. Its aim is to reach as far back as possible, when the first stars were forming, just a few hundred million years after the Big Bang.

Hubble has lasted ten years longer than expected. It will be succeeded by the James Webb Space Telescope, which is due for launch in 2018.

Glossary 詞匯表 (點擊單詞收聽發音)

主站蜘蛛池模板: jizzjizzjizz亚洲日本| 手机看片日韩国产 | 欧美日韩在线一区 | 日韩免费视频 | 欧美久久xxxxxx影院 | 成人影视大全 | 欧美国产视频 | 欧美成人h版在线观看 | 男人天堂社区 | 波多久久夜色精品国产 | 精品国产一区二区三区香蕉沈先生 | 国产精品原创av片国产免费 | 天天综合亚洲 | 亚洲精品一区二区三区精华液 | 小泽玛利亚一区二区 | 我和我的祖国电影在线观看免费版高清 | 国产欧美一区二区久久 | 国产露脸精品爆浆视频 | 国产亚洲综合成人91精品 | 亚洲日本片 | 日本三级香港三级网站 | 国产高清视频a在线大全 | 色999精品| 黄网站免费在线 | 国产一级毛片夜一级毛片 | 久久99视频精品 | 锵锵锵锵锵锵锵锵锵好大好湿软件 | 日本国产视频 | 欧美成a高清在线观看www | 一区二区国产在线观看 | 国产精品视频免费的 | 久草干| 日韩高清一区二区 | 久久综合九色综合欧洲色 | 午夜影院免费 | 国内成人啪啪网站 | www.尤物视频.com | 欧美屁股| 做羞羞视频 | 国产精品毛片无码 | 成人欧美在线观看 |