[维基词条]暗物质星
本帖最后由 liverpool 于 2010-12-21 06:47 编辑http://en.wikipedia.org/wiki/Dark_star_%28dark_matter%29
A dark star is a theoretical type of star that may have existed early in the history of the universe before conventional stars were able to form. They would be composed mostly of normal matter, like modern stars, but a high concentration of neutralinodark matter within them would generate heat via annihilationreactions between the dark matter particles. This heat would prevent them from collapsing into the relatively compact sizes of modern stars and therefore prevent nuclear fusion among the normal matter atoms from being initiated.
暗物质星是理论上预言在宇宙早期可能存在的一类星体，它们在常规恒星形成之前存在。和今天的恒星一样，它们主要由正常物质构成，但是能源来自于其内部高度聚集的(neutralino)暗物质的湮灭。暗物质湮灭产生的能量将阻止这些星体进一步坍缩至今天的恒星所拥有的更加致密的尺度，从而阻碍了点燃正常物质原子的核聚变。
Under this model, a dark star is predicted to be an enormous cloud of hydrogen and helium ranging between 4 and 2000 astronomical units in diameter and with a surface temperature low enough that the emitted radiation would be invisible to the naked eye.
该模型预期暗物质星是一块巨大的由氢和氦组成的云块，直径大约4-2000天文单位，表面温度很低以至于肉眼都看不见它们发出的辐射。
It is possible that dark stars have endured to the modern era. Although they would emit no visible light they could be detectable by their emissions of gamma rays, neutrinos, and antimatter and would be associated with clouds of cold molecular hydrogen gas that normally wouldn’t harbor such energetic particles.
很有可能暗物质星一直存留至今。虽然暗物质星不辐射可见光，但仍可以通过伽马射线，中微子以及反物质粒子等来探测它们，特别是针对一些正常说来不会发射这样的高能粒子的冷分子氢云。 很简短的几段文字的翻译。但我想说的是，英文维基也有不确切的地方。例如暗物质星实际上是发射可见光的，理论估算其温度大约在几千到一万开，质量很大，大约几百到上千太阳质量。相比较正常的大质量恒星而言，暗物质星温度低很多，但是仍然可以辐射可见光。
关于暗物质星的探测，讨论得更多的还是通过JWST这样的大型望远镜直接去探测。通过伽马射线，中微子，反物质粒子这样的办法去探测也不算是较好的策略，虽然可以作为辅助手段。 LZ你太猛了！ LZ强悍。我也要学好英文，将来得心应手的看英语书刊 不错。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
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