恒星

In fact, the bright star near the center of this nebula is likely only a few hundred thousand years old, powering the nebular glow as it clears out a cavity in the molecular cloud\'s star forming dust and gas.

实际上，该星云中央附近的明亮恒星的年龄可能仅仅几十万岁，它们引起星云发光并在分子云的恒星形成的尘埃和气体中清扫出一片空洞。

Meditations of evolution increasingly vaster: of the moon invisible in incipient lunation, approaching perigee: of the infinite lattiginous scintillating uncondensed milky way, discernible by daylight by an observer placed at the lower end of a cylindrical vertical shaft 5000 ft deep sunk from the surface towards the centre of the earth: of Sirius 10 lightyears (57,000,000,000,000 miles) distant and in volume 900 times the dimension of our planet: of Arcturus: of the precession of equinoxes: of Orion with belt and sextuple sun theta and nebula in which 100 of our solar systems could be contained: of moribund and of nascent new stars such as Nova in 1901: of our system plunging towards the constellation of Hercules: of the parallax or parallactic drift of socalled fixed stars, in reality evermoving wanderers from immeasurably remote eons to infinitely remote futures in comparison with which the years, threescore and ten, of allotted human life formed a parenthesis of infinitesimal brevity.

347关于宇宙日益扩大进化的冥想：新月期的月亮，即使在近地点也看不见。从地表向地轴挖掘纵深五千英尺的圆筒状垂直轴，一个观察者呆在轴底儿上，就连白昼也辨认得出那漫无止境、网络状、亮光闪闪、非凝结性的银河。天狼距地球十光年（五七、000、000、000、000英里）；体积大于地球九百倍；大角；岁差运动；有着&猎户&腰带、六倍于太阳的&伐二&以及星云的猎户座，星云中能容纳我们的一百个太阳系；死去的和新生的星宿，例如一九0 一年的那颗&新星&我们的太阳系正朝着武仙座冲去；所谓恒星的视差或视差移动，也就是说，实际上恒星是在不断地从无限遥远的太古朝无限遥远的未来移动着。相形之下，人的寿命充其量才七十年，不过是无限短暂的一段插曲而已。

The star lies 300 trillion miles, or about 50 light-years, from Earth; the planetlike object is estimated to be 10 to 40 times the size of Jupiter.

然而，类似系统所绕恒星是巨恒星，质量远远超过太阳。

A number of sourceless cores, UC HII regions and their physical parameters were obtained. Initial conditions of masive star formation were inspected. This provided samples for further larger observations.

对用MSX、IRAS选取的一批样品进行CO及其同位素成图观测研究，获得了无源云核、原恒星云核及UC HII区云核及其物理参量，考察大质量恒星形成初始条件，同时为更大规模脉泽观测准备样品。

Now observations of formerly sunlike stars called white dwarfs suggest that the overwhelming majority of them once harbored at least one rocky world.

现在，对曾经是类日恒星的白矮星所进行的观测表明，绝大部分的类日恒星至少曾经拥有一个岩石星球。

And because sunlike stars could account for up to half of the Milky Way's population of several hundred billion suns, that means hundreds or even thousands of civilizations might inhabit our galaxy.

在银河系的几千亿颗恒星中，类日恒星占多达半数，因此这意味着可能有几百、甚至几千种文明存在于我们的星系中。

That, in turn, suggests Gliese 581c is likely to be tidally locked to its orbital period, so that one side of the planet always faces the star and the other never does.

这反过来也就说明Gliese 581c受其运行周期的影响将会出现潮汐锁定，这就意味着星球的一边会一直对着恒星，而另一边却一直背对恒星。

This gorgeous view also includes two foreground globular star clusters NGC 362 and 47 Tucanae.

船底座星云是年轻，极大质量恒星的家园，包括始终是一样可见的海山二星，是一颗质量比太阳大100倍的恒星。

Alternatively,if the star were small, the life-supporting planet would have to have close orbit round it and also provide the perfect conditions for life forms to develop.

反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行，而且要有极好的条件才能使生命得以发展。

A "global" starburst like NGC 4449 resembles primordial star forming galaxies which grew by merging with and accreting smaller stellar systems.

像 NGC4449 这样的整体星暴类似于最原始的恒星形成星系，这些星系通过与较小恒星系统的合并和共生来成长起来。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。