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主题：科学英语:每日星相(6.30)

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每日星相

Daily Astronomy

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The moon still close to white-hot Spica

Tonight is Tuesday, Jun 30 2009

If you took the time machine into the past last night with the bright star Spica, you noticed the waxing gibbous moon was to the west (or right) of Spica. Tonight the moon is to the east (or left) of Spica. This motion of the moon on our sky’s dome is due to the moon’s actual motion in orbit around Earth.

The Moody Blues refer to the moon as the “cold hearted orb that rules the night,” but the same can hardly be said for Spica. About 2,200 times as bright visually as the sun, Spica also is one of the hottest stars visible to us, with a surface temperature of more than 22,000 kelvins. That’s nearly four times our sun’s surface temperature. Spica is so hot that a large part of its energy manifests is ultraviolet rather than visible light. In actuality, Spica’s total energy output is about 15,000 times that of the sun.

But that’s not a totally fair comparison, because Spica is not just one star, but a spectroscopic binary. That means that there are really two hot blue-white stars orbiting so close that they cannot be separated in in a normal telescope, and their binary nature is discernible only through an analysis of their light.

Written by Larry Sessions , 30 June 09

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楼主 Date: 2009-06-30 08:59:04

tzq1984

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10 积分给tzq1984

it is hard to undestand, but it is interesting to know something we never notice. Supportive!!!

沙发 Date: 2009-06-30 09:17:18

the_doctor

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10 积分给the_doctor

The Moody Blues乐队曾把月亮比作“主宰夜空的冷艳球体”，但是Spica星可就不能这么形容了，比太阳亮2200倍的Spica星，是肉眼能看见的最热的星星之一，表面温度高于22000开尔文。这差不多是太阳表面温度的4倍。Spica因为太热的关系，它放射出的大部分能量不是可见光，而是紫外光。实际上，Spica输出的总能量是大约太阳的15000倍。
最后由 the_doctor 于 2009-06-30 18:42:52编辑

板凳 Date: 2009-06-30 11:04:16

lonway

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20 积分给lonway

If you took the time machine into the past last night with the bright star Spica, you noticed the waxing gibbous moon was to the west (or right) of Spica. Tonight the moon is to the east (or left) of Spica. This motion of the moon on our sky’s dome is due to the moon’s actual motion in orbit around Earth.
如果你昨晚乘时间机器返回到过去，你注视到近满月的月儿在天门星西部（或右部）。今晚月亮将在天门星东方或（左侧）月亮在我们天空弧顶的该运动是因为月亮在轨道上的实际运动是绕着地球转。
The Moody Blues refer to the moon as the “cold hearted orb that rules the night,” but the same can hardly be said for Spica. About 2,200 times as bright visually as the sun, Spica also is one of the hottest stars visible to us, with a surface temperature of more than 22,000 kelvins. That’s nearly four times our sun’s surface temperature. Spica is so hot that a large part of its energy manifests is ultraviolet rather than visible light. In actuality, Spica’s total energy output is about 15,000 times that of the sun.

忧郁的蓝调指的是月亮作为“统治夜空的冷心天体”，但这样很难去解释天门星。视觉上明亮程度是太阳的2200倍，天门星我们可见的最热的星星之一，它的表面温度超过22000K。差不多是我们太阳表面温度的四倍。天门星如此的热以至于它能量的很大部分以紫外线而非可见光的形式表现出来。事实上，天门星整个能量输出是太阳的15000倍。

But that’s not a totally fair comparison, because Spica is not just one star, but a spectroscopic binary. That means that there are really two hot blue-white stars orbiting so close that they cannot be separated in in a normal telescope, and their binary nature is discernible only through an analysis of their light.

但那并不是非常公正的比较，因为天门星不只是一颗星，而是可用分光镜看见的双体星。这就意味着有两颗炙热的蓝-白星星在轨运行，它们如此的近以至于用正常的望远镜无法区分开，而且它们的双体性质只能通过对它们的光进行分析才能辨别。

Written by Larry Sessions , 30 June 09

Larry Sessions写 09.6.30

仅供参考谢谢祝你愉快
最后由 lonway 于 2009-06-30 15:11:47编辑

4 楼 Date: 2009-06-30 15:10:38

lcszgx

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10 积分给lcszgx

But that’s not a totally fair comparison, because Spica is not just one star, but a spectroscopic binary. That means that there are really two hot blue-white stars orbiting so close that they cannot be separated in in a normal telescope, and their binary nature is discernible only through an analysis of their light.
但是这种比较并不完全公平，主要有因为Spica 并非单一星体，而是分光双星，即两个紧密靠近且同轨道运行能发出蓝白光的星体，并且很难用普通的天文望远镜分辨出来，他们的双体性质只能通过光谱分析才能分辨。
最后由 lcszgx 于 2009-06-30 19:40:08编辑

5 楼 Date: 2009-06-30 19:37:33

ベ蝶舞ゞ幽嘉

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10 积分给ベ蝶舞ゞ幽嘉

If you took the time machine into the past last night with the bright star Spica, you noticed the waxing gibbous moon was to the west (or right) of Spica. Tonight the moon is to the east (or left) of Spica. This motion of the moon on our sky’s dome is due to the moon’s actual motion in orbit around Earth.
如果昨晚和明亮的明星穗乘着时光机器返回到过去，你将会发现拱形的月亮在星穗的西部（右边），今晚月亮在星穗的东部（左边）。月亮的的这种运动状态在我们的空中是由于月亮的实际运作在环绕地球运转。

6 楼 Date: 2009-06-30 20:31:58

胡栗榕

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10 积分给胡栗榕

If you took the time machine into the past last night with the bright star Spica, you notice the waxing gibbous moon was to the west (or right) of Spica. Tonight the moon is to the east (or left) of Spica. This motion of the moon on our sky’s dome is due to the moon ‘s actual motion in orbit around Earth.

若你和那个光亮的室女座α星一起乘坐时间机器回到昨晚，你会察觉到室女座α星在渐盈凸月的西面（即，室女座α星的右边）。而今天晚上，月亮在室女座α星的东面（即，室女座α星的左边）。月亮在苍穹中变换了位置是因为它正围绕地球运转所造成的。

最后由胡栗榕于 2009-07-01 01:09:48编辑

7 楼 Date: 2009-07-01 01:05:29