Astronomy Picture of the Day
探索宇宙！每天一幅不同的影像或照片，并由专业天文学家的简短解释和说明，带你遨游迷人的宇宙。
2006年5月1日（农历二〇〇六年四月初四）
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http://antwrp.gsfc.nasa.gov/apod/image/0605/ngc290_hst_big.jpg
疏散星团: 一个恒星珠宝盒
影像提供: ESA & NASA; 志谢: E. Olszewski (U. Arizona) HST
Explanation: Jewels don't shine this bright -- only stars do. Like gems in a jewel box, though, the stars of open cluster NGC 290 glitter in a beautiful display of brightness and color. The photogenic cluster, pictured above, was captured recently by the orbiting Hubble Space Telescope. Open clusters of stars are younger, contain few stars, and contain a much higher fraction of blue stars than do globular clusters of stars. NGC 290 lies about 200,000 light-years distant in a neighboring galaxy called the Small Cloud of Magellan (SMC). The open cluster contains hundreds of stars and spans about 65 light years across. NGC 290 and other open clusters are good laboratories for studying how stars of different masses evolve, since all the open cluster's stars were born at about the same time.
解释: 珠宝不会如此的闪耀明亮---只有星星能.就如宝石在珠宝盒里, 美丽地闪烁着各种不同的光芒和颜色.上面这张上镜的照片是轨道上的哈勃太空望远镜最近拍摄的. 疏散星团里的恒星都很年轻,包含很少的恒星, 拥有和球状星团比起来较高比率的蓝色恒星. NGC 290位于200,000光年远的小麦哲伦云星系(SMC) .这个疏散星团包含数以百计的恒星,跨度大约是65光年.NGC 290 和其它疏散星团是很好实验室来研究不同质量的恒星是如何演化的, 因为所有的疏散星团星是出生于大致同样时间