美国国家航空航天局NASA每日一图(天文)-2017年7月11日

2017 July 11

Star Cluster Omega Centauri in HDR
Image Credit & Copyright: Mike O'Day
Explanation: Behold the largest ball of stars in our galaxy. Omega Centauri is packed with about 10 million stars, many older than our Sun and packed within a volume of only about 150 light-years in diameter. The star cluster is the largest and brightest of 200 or so known globular clusters that roam the halo of our Milky Way galaxy. Though most star clusters consist of stars with the same age and composition, the enigmatic Omega Cen exhibits the presence of different stellar populations with a spread of ages and chemical abundances. In fact, Omega Cen may be the remnant core of a small galaxy merging with the Milky Way. The featured image shows so many stars because it merged different exposures with high dynamic range (HDR) techniques. Omega Centauri, also known as NGC 5139, lies about 15,000 light-years away toward the southern constellation of the Centaurus.

2017年7月11日

星群欧米茄半人马座在HDR
图片来源和版权:Mike O'Day
说明:看到我们星系中最大的恒星球。 欧米茄半人马座拥有大约1000万颗恒星,比我们的太阳要老,包装的直径只有大约150光年。 星群是200个左右已知的球状星团中最大和最亮的,它们漫游我们的银河系的光环。 虽然大多数星团由具有相同年龄和组成的恒星组成,但是神秘的欧米茄岑表现出不同恒星群体的存在,具有年龄和化学丰度的传播。 事实上,欧米茄岑可能是与银河系融合的小星系的剩余核心。 特色图像显示了这么多的星星,因为它融合了高动态范围(HDR)技术的不同曝光。 欧米茄半人马座也被称为NGC 5139,距离南极的半人马座距离约15,000光年。

 

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