烟火与流星
[align=center][color=red][b]影像版权与提供:[/b] [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.jimsteele.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=ALkJrhhWMnD5qTmMsoOLNF6dJGW6q1PONg][color=red]Jim Steele[/color][/url][/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0208/fireworks_steele.jpg[/img]
[color=green][b]说明:[/b]在测试新望远镜和新相机时，摄影家Jim Steele在美国． [align=left]奥勒冈州艾席兰市(Ashland)的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://kids.msfc.nasa.gov/Stories/ViewStory.asp%3FID%3D562&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=ALkJrhgwiUT3gVds8pN0q_6p16ZzBKVW0w]夜空[/url] ，拍到了这幅超现实但是充节庆气氛的影像。 [/align][align=left]摄影的那天是[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap990704.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=ALkJrhjyY3A-L2Z1I6obmlB0BjfDLgvCHg]7月4日[/url] ，而这场烟火是[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://lcweb2.loc.gov/ammem/&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=ALkJrhhRNNqjgBCmiI_h6c5u7MVqhIt07g]美国[/url]庆祝独立纪念日传统活动的一部份。 [/align][align=left]在这个周末，另一种年度盛事也将降临在[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.darksky.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=ALkJrhgIlPo3cOFhCrpNu8nrZu8QzDJG9A]黑夜[/url]中，它是称为[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://science.nasa.gov/headlines/y2002/19jul_perseids.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=ALkJrhgoboQq5TD4gI6AVs3Z426K4xTh8w]英仙座流星雨[/url]的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question12.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=ALkJrhhYiKm2_-vEaTE5SqgvRV9UgQgjYg]陨星[/url]的活动。 [/align][align=left]英仙座流星并不是陨落的星星，而是来自周期彗星[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap960219.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=ALkJrhg7daFuGSr3zaZisj2ESMcNrFOQeg]史威福-塔托(Comet Swift-Tuttle)[/url]的小碎片所造成的。 [/align][align=left]随着每年地球绕太阳公转，当它穿过这颗彗星的彗星尘埃河时，就会发生流星雨的现象。 [/align][align=left]这些彗星尘以数十公里的高速射入地球的大气，会发生汽化并拖着[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap010810.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=ALkJrhgfrNDw6aAMYaQ8NYyI-8MhZMOJ7g]明亮[/url]且有时很[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap000812.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=ALkJrhhCOlBFHZ5uWdJAzAX9HE5vD_uTfA]美丽的流星迹[/url]掠过夜空。 [/align][align=left]虽然接下来的这几天都可以观赏[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://comets.amsmeteors.org/meteors/showers/perseids.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=ALkJrhhVKxTh3Xaz2jA3VcCXZ2_YSJWwTA]英仙座流星雨[/url] ，不过预测它的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://science.nasa.gov/headlines/y2002/07aug_horseflies.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=ALkJrhjPAnxB8knFdWGCwF6mepugBqCpXw]最大期是在8月12日到13日[/url] ，届时在无月的清晨时分，每小时大约可以看到超过数十颗流星。[/color] ::42:: ::42:: ::42:: [size=2][color=magenta](转自成大天文学教室)[/color][/size][/align]
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