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主题：科学英语:每日星相(6.29)

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每日星相

Daily Astronomy

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View Spica and hundreds of years into the past

Tonight is Monday, Jun 29 2009

What if you had a time machine and could travel back into the past? You can’t do that, but you can look back in time – literally – when you look out in space. Due to the limited speed of light, absolutely everything we see is in the past, from a tiny fraction of a second for things around us to thousands of years for distant stars.

Take the star Spica, for example. It’s that bright star in the southern heavens just as it gets dark tonight. The waxing gibbous moon is a bit off to the right (west). Our view of the moon is less than a second and a half old, but the light from Spica left the star 260 years ago. We see it as it was in the year 1747.

So what happened on Earth in the year that light left Spica? Aside from the birth of Johann Bode (of Bode’s Law fame) and Thomas Lind’s discovery that citrus fruits prevent scurvy, not much. Still, it’s fascinating to know you’re looking back in time, when you look at distant stars!

Written by Larry Sessions , 29 June 09

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楼主 Date: 2009-06-29 08:59:04

doubengo

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10 积分给doubengo

What if you had a time machine and could travel back into the past?
要是你有一台时光机器,并且它把你带到过去又能怎么样呢?

沙发 Date: 2009-06-29 09:20:18

the_doctor

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10 积分给the_doctor

给你一台可以返回过去的时光机如何？那当然是不可能啦，但是你可以亲眼看见过去的时间呢-我是说真的-当万物映入眼帘的时候。因为光本身速度有限，所以几乎我们看见的每一样事物都是来自过去，身边东东来自几微秒前的过去，而夜空中繁星则来自千百年前的过去。

就拿室女座α星来说吧。当夜幕降临的时候，它是南星空最亮的星星。

真的是很有意思的一篇文呢虽然古时和现今的月亮不同，但是看着遥远的星星的时候却能分享古人一样的景象实在是一件风雅的事情呀

最后由 the_doctor 于 2009-06-29 09:44:04编辑

板凳 Date: 2009-06-29 09:30:31

lcszgx

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10 积分给lcszgx

You can’t do that, but you can look back in time – literally – when you look out in space.
显然你做不到这一点，但是当你仰望太空，你就会及时而真切回顾过去。

4 楼 Date: 2009-06-29 09:31:49

tzq1984

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10 积分给tzq1984

Travelling back to the year......

5 楼 Date: 2009-06-29 09:40:53

lucyangela

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10 积分给lucyangela

让你拥有一台时光机，你也可以回到远古时期，那会是什么情形呢？显然，你做不到。但是，当你放眼太空，你是可以看到过去的——千真万确！
由于光速的限制，确切一点说，我们看到的每一样事物都是其过去的状态——周围映入眼帘的事物实际上是数秒前的情形，遥远的星球实际上是数千年前的状态。
翻译虽然很难，本人水平也很有限，但我愿意尝试！只是苦于没有时间。谢谢前辈！先这些吧。

6 楼 Date: 2009-06-29 11:45:08

amy_ooo

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10 积分给amy_ooo

What if you had a time machine and could travel back into the past? You can’t do that, but you can look back in time – literally – when you look out in space. Due to the limited speed of light, absolutely everything we see is in the past, from a tiny fraction of a second for things around us to thousands of years for distant stars
假若你有台时光机并乘着它回到过去，那会怎样? 当然，这是不可能的，然而,千真万确地，当你仰望星空时，你将看到过往。由于光有限的速度，我们所看到的一切都存在于过去。从一瞬前的事物再到数千年的遥远星辰无一例外。
Take the star Spica, for example. It’s that bright star in the southern heavens just as it gets dark tonight. The waxing gibbous moon is a bit off to the right (west). Our view of the moon is less than a second and a half old, but the light from Spica left the star 260 years ago. We see it as it was in the year 1747.
就拿Spica星来说吧，例如今宵，当夜幕降临时，它是南方天空如此明亮的一颗星晨。今宵的渐盈月则略微偏离西方。其实，我们所见的月亮的象实际小于一秒，并且，是它自身年龄的一半。但是从Spica星射出的光却源于260年前，我们所看到的是它1747年的样子。

So what happened on Earth in the year that light left Spica? Aside from the birth of Johann Bode (of Bode’s Law fame) and Thomas Lind’s discovery that citrus fruits prevent scurvy, not much. Still, it’s fascinating to know you’re looking back in time, when you look at distant stars!

那么，在光线从 Spica射出的那年，这世上究竟发生了什麽？除了Johann Bode 的出生及Thomas Lind用柑橘类水果防治坏血病的发现外，就没什麽大事了。当你仰望着遥远的星辰，想到你正在凝望过往时，是多么令人陶醉啊。

7 楼 Date: 2009-06-29 14:47:46

董雷鸣1987

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5 积分给董雷鸣1987

Take the star Spica, for example. It’s that bright star in the southern heavens just as it gets dark tonight.
就如Spica，她是南方天际里如此耀眼的一颗明星，今晚却变得如此昏暗。

8 楼 Date: 2009-06-30 08:37:46

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5 积分给lcszgx

The name 'Spica' is Latin; it means 'Ear of Corn'. The star it refers to is a bright and hot blue star more than 260 light years (about 80 parsecs) from the Earth. In fact, Spica is a binary star, and is circled by an invisible companion, causing its brightness to vary slightly every four days. Spica's magnitude is +0.9, making it the sixteenth brightest star in the sky, after Antares in Scorpius.

9 楼 Date: 2009-06-30 08:49:51