ngc6822：巴纳德星系
(原标题: NGC 6822: Barnard's Galaxy)
2021-12-02
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大的螺旋星系似乎常常得到所有的荣耀，炫耀着它们年轻、明亮、蓝色的星团在美丽、对称的螺旋臂上。但小星系也会形成恒星，比如附近的NGC 6822，也被称为巴纳德星系。在人马座丰富的星域之外，NGC 6822距离我们只有150万光年，是我们本星系群的一员。ngc6822是一个类似小麦哲伦星云的矮不规则星系，直径约7000光年。银河系中前景较亮的恒星有着尖状的外观。在它们的后面，巴纳德星系充满了年轻的蓝色恒星，在这张深彩色合成图像中，恒星形成区域的粉红色氢光斑斑相杂。
查看原文解释
Grand spiral galaxies often seem to get all the glory, flaunting their young, bright, blue star clusters in beautiful, symmetric spiral arms. But small galaxies form stars too, like nearby NGC 6822, also known as Barnard's Galaxy. Beyond the rich starfields in the constellation Sagittarius, NGC 6822 is a mere 1.5 million light-years away, a member of our Local Group of galaxies. A dwarf irregular galaxy similar to the Small Magellanic Cloud, NGC 6822 is about 7,000 light-years across. Brighter foreground stars in our Milky Way have a spiky appearance. Behind them, Barnard's Galaxy is seen to be filled with young blue stars and mottled with the telltale pinkish hydrogen glow of star forming regions in this deep color composite image.
© Dietmar Hager