透过「极大型望远镜」看螺旋星系NGC 2997
[align=center][color=red][b]影像提供:[/b] [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.eso.org/instruments/fors1/&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=ALkJrhiucwjy6FGZIpKTX7A1_h7tkfwBJA][color=red]FORS Team[/color][/url][color=red] , [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.eso.org/projects/vlt/&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=ALkJrhgqiqjiY1tcfNii2_hm83EbL7E8TQ][color=red]8.2-meter VLT[/color][/url][color=red] , [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.eso.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=ALkJrhhwMbw8itwjekIv-8wFd62OjJnlyQ][color=red]ESO[/color][/url][/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0208/ngc2997_vlt_big.jpg[/img]
[color=green][b]说明:[/b] NGC 2997是一个大型的[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/messier/spir.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=ALkJrhjzd7STCJeqbIQHTp2z71e8_wQNAQ][color=green]螺旋星系[/color][/url][color=green] .由核心细小与螺旋臂松散，使他被归类成[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://zebu.uoregon.edu/~js/ast123/lectures/lec13.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=ALkJrhiif9wG-M_Ra7cinCHgkFOTp9tDJg][color=green]Sc[/color][/url][color=green]型星系。 [align=left][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.eso.org/outreach/press-rel/pr-1999/pr-06-99.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=ALkJrhiXkq7KjK32M5J4-K9pvyBo2IwttA]上图所示的[/url] NGC 2997，正以每秒1100公里的速度[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://archive.ncsa.uiuc.edu/Cyberia/Cosmos/ExpandUni.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=ALkJrhjkHsE_iS-zW0V7Jl-wAC0JyQUgBQ]远离[/url]我们。 [/align][align=left]他是位于5千5百万[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.edu/photo/cosmic_distance.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=ALkJrhhL4_8VhdkJ8bKW77tjv0RR_A6XEA]光年[/url]的远处，他的远离速度可以让我们估计出我们宇宙的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://csep1.phy.ornl.gov/guidry/violence/hubble_constant.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=ALkJrhh-daGc-f89EbSQcsec181FDjCAgA]膨胀速率[/url] 。 [/align][align=left]一般认为[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.ast.cam.ac.uk/AAO/images/captions/aat017.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=ALkJrhi9w_d3UqhaZkbd3dttoMaGNpLjqA]NGC 2997[/url]的质量大约有[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/sun.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=ALkJrhh6DSuc2GeTc7Bbhok1HlTfGzp2_Q]太阳[/url]质量的一千亿倍，然而他却臂我们的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://casswww.ucsd.edu/public/tutorial/MW.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=ALkJrhhJqSgpUriYrANoYoG4XStUXDcnjA]银河系[/url]的要轻一些。 [/align][align=left]NGC 2997并不是[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap011004.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=ALkJrhhZFbVq391gSMzHbzDN_0wh8VMcxw]正对着我们[/url] ，而是以45度的倾斜的姿态对着我们。 [/color][/align][align=left][color=green]NGC 2997最[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query%3F1989ApJ...341..722W&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=ALkJrhjss7V23G7hpsosjDmVXUja89LXjQ][color=green]值得[/color][/url][color=green]注意的是他那被一连串由巨大[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://csep10.phys.utk.edu/astr162/lect/light/ionization.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=ALkJrhgjRnKbj5l23Xj-GXQotzmE3jlwTw][color=green]游离[/color][/url][color=green] [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://pearl1.lanl.gov/periodic/elements/1.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=ALkJrhi0Jgpdfdm2vJ7DNparFFmGwClbiQ][color=green]氢[/color][/url][color=green]分子云所包围的[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap020603.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=ALkJrhh3UvoZs4_0xuPtA2KZX0cInOumWQ][color=green]核心[/color][/url][color=green] 。[/color]::42:: ::42:: ::42:: [size=2][color=magenta](转自成大天文学教室)[/color][/size][/align] 沙发::42:: ::42:: ::42:: ::42:: VLT，甚大望远镜？ 多大的天文望远镜呀，一辈子没机会啦，哈哈 这望远镜不得不令人惊叹，螺旋星系实在离我们太遥远了！ 真美啊！什么星系？ 它是NGC2997。::33:: 美的说不成~~~~~~~~~~~~~~ So beautiful.不知道要多大口径的望远镜才能see到::0020:: 这个是甚大望远镜阵吧，台湾的翻译可能有些和国内的出入 翻译成“甚大”是不是更好点？
一个介绍
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