人马座星团
[align=center][color=red][b]影像提供:[/b] [/color][email=heritage@stsci.edu][color=red]Hubble Heritage[/color][/email][color=red] [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://heritage.stsci.edu/public/commonpages/heritagebios.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhic16RkKKLuOji_vjakUMHo_L2CYw][color=red]Team[/color][/url][color=red] ( [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.aura-astronomy.org/&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhhkw3EvFd1WqEGXFyVAyBtbwArl1w][color=red]AURA[/color][/url][color=red] / [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.stsci.edu/&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhgO1bwJADlE5dzwqpfrAzrgDbmt8g][color=red]STScI[/color][/url][color=red] / [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.nasa.gov/&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhj_xlqOJA-k78QP_ky3FPssLJYzsQ][color=red]NASA[/color][/url][color=red] )[/color] [/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0105/sgr1_hst_big.jpg[/img]
[color=green][b]说明:[/b] [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://zebu.uoregon.edu/~soper/Stars/color.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhipsJkW2gbeh3I691Fm-_fAox4l5g][color=green]恒星的颜色[/color][/url][color=green]也可以是五彩缤纷的，它们的颜色代表它们[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://csep10.phys.utk.edu/astr162/lect/stars/cindex.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhhJoLqmTlUUI2dvXAY9kTHGcLwzuw][color=green]表面温度[/color][/url][color=green]的高低，而从恒星的颜色就可以定出它的[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.skypub.com/tips/basics/spectra.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhh3zIxdXq4pp178g6oUZ5vLMj3zaQ][color=green]光谱类型(spectral type)[/color][/url][color=green] 。 [align=left]上面的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://heritage.stsci.edu/public/Oct22/sgr1/sgrtable.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhhGYbFL62YQg9_d4Rv-1UQqub5qSw]人马座星团(Sagittarius Star Cloud)[/url]中，大部份恒星的颜色多是红色或橘红色，而且都比较暗，从远处看来，我们的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap980830.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhjes7NX2S11WQ4w-f_OEj6LThskbg]太阳[/url]看起来也和这些恒星很像。 [/align][align=left][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://antwrp.gsfc.nasa.gov/htmltest/gifcity/msblues.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhj_8GezJPx_1hXekLGAiwdbVYDVQg]蓝色[/url]及浅绿色恒星的温度比较高，它们是大质量的年轻恒星。 [/align][align=left]比较亮的红色恒星，是表面温度较低的红巨星(Red Giant)。 [/align][align=left]在很久以前， [url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://plabpc.csustan.edu/astro/stars/giant.htm&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhjNVipHzxasdvQlo48R2NE0AlF6uw]红巨星[/url]原来是和我们的太阳很相似的恒星，不过当它们[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.aegis1.demon.co.uk/tutorials/stellar.htm&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhgLqgXxk4alWwd1pEJfDBPvIW9E4Q]演化[/url]到末期时，就膨胀形成非常巨大的恒星。 [/align][align=left]人马座恒星团离[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap990621.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhjP8gE_hOaqrtsvDDtGstnQLfeTZw]银河中心[/url]不远，这个方向的恒星通常会被前面大片[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap990919.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhij9a-m0wy1huguh1peN6sygtufnw]黝黑[/url]的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap001119.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhjO737KCu8RYWnYoVimkEiVUhwljA]尘埃[/url]云所遮蔽，而人马座星团恰好位在尘埃云的隙缝里，所以我们才能看到这个宇宙[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap961111.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhiNgYWC1viSjQdMrrz3e9z13EIKSw]珍宝[/url] 。 [/align][align=left]这个著名的恒星团，聚集了一些银河系中[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap001029.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhi9R393HTmAoKcRRnbSZAJAknxSsg]最古老[/url]的恒星。[/color] ::42:: ::42:: ::42:: [size=2][color=magenta](转自成大天文学教室)[/color][/size][/align]
[[i] 本帖最后由 zheng123 于 2008-8-24 05:42 编辑 [/i]] 天哪，一堆亮点？::cayanjing:: 确实很多漂亮的星星！五颜六色的！！::42:: ::42:: ::42:: 只能表达2个字：壮观！ 有点俗气 有没有感觉像宝石啊
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