NGC 7008:胚胎星云
[align=center][b][color=red]Credit & [/color][/b][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/lib/about_apod.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=ALkJrhjEYbgTam0PvBj56-xrCjEpr-uGWQ#srapply][b][color=red]Copyright[/color][/b][/url][color=red][b] :[/b] [/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.stargazer-observatory.com/&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=ALkJrhgJQUDuYk0ih0ElO1Tk1Ru1f5ueVg][color=red]Dietmar Hager[/color][/url][color=red] , [/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://dg-imaging.astrodon.com/&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=ALkJrhgMOheLHZv2_e7TQuPMy3JjFTXkqw][color=red]Don Goldman[/color][/url][color=red] , [/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.backyardastronomer.com/&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=ALkJrhj8f05R8MwnXtHfB3ot_TgNo_HT9A][color=red]Paul Mortfield[/color][/url][size=3][color=blue](2008年8月25日)[/color][/size] [/align][align=left][color=green][b]说明:[/b]这个位在[/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap070920.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=ALkJrhgdcEbeXsF0HFzlUyN5cnfLz9XFjA][color=green]星云密集[/color][/url][color=green]的天鹅座的行星状星云NGC 7008，形状呈现相当紧密的圆形，离我们约有2800光年远．[/color][/align][align=left][color=green]上面这张[/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.stargazer-observatory.com/ngc7008.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=ALkJrhgwiOnPKU8Jn-qSAfqYuRW_KaSiCQ][color=green]细节分明[/color][/url][color=green]的NGC 7008影像，是由两架不同的望远镜分别以宽波段和窄波段拍摄，总耗时12小时才完成。 [/color][/align][align=left][color=green]此星云[/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.universetoday.com/2008/06/30/cosmic-mystery-ngc-7008-by-dietmar-hager/&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=ALkJrhi1XFrVPlTsHeIazohfBQrO6tWCVw][color=green]有趣的模样[/color][/url][color=green]而被昵称为胚胎星云，但是事实上[/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/messier/planetar.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=ALkJrhgQ2Xwf_-CHgp3Zo_-Xw9ZxzZI-kw][color=green]行星状星云[/color][/url][color=green]并不是意味着恒星的诞生而是恒星死亡。 [/color][/align][align=left][color=green]像NGC 7008的产生是由一个类太阳恒星[/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.astro.washington.edu/balick/WFPC2/&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=ALkJrhg1p6tCE0fSkFQnZBHDK6JRRYQMDQ][color=green]濒死[/color][/url][color=green]前所抛出的气壳，中心的恒星最终冷却成[/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap000910.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=ALkJrhh29k2OlAiOPlUcxledxqAsjybQrg][color=green]白矮星[/color][/url][color=green] ，就像是NGC 7008中心的那颗一般。 [/color][/align][align=left][color=green]在[/color][url=http://203.208.37.104/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.perezmedia.net/beltofvenus/archives/000817.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=ALkJrhib-PrwB9xRkrM7ZOGir97UQ0h8UQ][color=green]NGC 7008后方[/color][/url][color=green]有个与其无关的双星系统，图中可见其呈现金色与蓝色，相当可爱。[/color]::42:: ::42:: ::42::
[/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0808/ngc7008_hagercollab.jpg[/img]
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[size=2][color=magenta](转自成大天文学教室)[/color][/size]
[[i] 本帖最后由 zheng123 于 2008-8-25 14:16 编辑 [/i]] 不错，路过:D :D :) :D
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