这是来自美国航空航天局的Chandra X射线天文台和Hubble空间望远镜的新作NGC 6543复合图像，著名的猫眼星云。这个著名的天体之所以被叫做行星状星云是因为其代表了一个行星进化的阶段，就好比太阳形成至今几十亿年间所经历过的。当一颗类似太阳的恒星用尽燃料时，便进入一个通常叫做红巨星的状态。在这个阶段，恒星抛洒其外层物质，留下一个炙热的核心，并最终形成极高密度的白矮星。从核心区喷出的星风吹向大气，并把其推开，同时形成了在光学望远镜下所观察到的优美丝状结构。
This composite of data from NASA's Chandra X-ray Observatory and Hubble Space Telescope is a new look for NGC 6543, better known as the Cat's Eye nebula. This famous object is a so-called planetary nebula that represents a phase of stellar evolution that the Sun should experience several billion years from now. When a star like the Sun begins to run out of fuel, it becomes what is known as a red giant. In this phase, a star sheds some of its outer layers, eventually leaving behind a hot core that collapses to form a dense white dwarf star. A fast wind emanating from the hot core rams into the ejected atmosphere, pushes it outward, and creates the graceful filamentary structures seen with optical telescopes.
自翻。。。。
来自钱德拉
[ 本帖最后由 江涛 于 2008-8-21 11:25 编辑 ] |
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