美国国家航空航天局NASA每日一图(天文)-2017年6月28日

 

2017 June 28

Explanation: The beautiful Trifid Nebula, also known as Messier 20, lies about 5,000 light-years away, a colorful study in cosmic contrasts. It shares this nearly 1 degree wide field with open star cluster Messier 21 (top left). Trisected by dust lanes the Trifid itself is about 40 light-years across and a mere 300,000 years old. That makes it one of the youngest star forming regions in our sky, with newborn and embryonic stars embedded in its natal dust and gas clouds. Estimates of the distance to open star cluster M21 are similar to M20's, but though they share this gorgeous telescopic skyscape there is no apparent connection between the two. M21's stars are much older, about 8 million years old. M20 and M21 are easy to find with even a small telescope in the nebula rich constellation Sagittarius. In fact, this well-composed scene is a composite from two different telescopes. Using narrowband data it blends a high resolution image of M20 with a wider field image extending to M21.

2017年6月28日

解说:美丽的Trifid星云,也叫梅西Messier 20,距离5000光年远,是宇宙对比的一个多彩的研究。它拥有这个近1度宽的领域,开放的明星集群梅西耶21(左上)。Trisected的灰尘本身就有40光年宽,只有30万年。这使它成为我们天空中最年轻的恒星形成区域之一,它的新生和胚胎恒星镶嵌在其诞生的尘埃和气体云中。对开放星团M21的距离的估计与M20类似,但他们分享了这种华丽的skyscape伸缩,两者之间没有明显的联系。M21的恒星年龄要大得多,大约有八百万岁。在星云丰富的人马座星云中,即使是一个小望远镜也很容易找到M20和M21。事实上,这是一个由两架不同望远镜组成的组合场景。利用窄带数据,将M20的高分辨率图像与一个更宽的视场范围扩大到M21。

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  • 厉害!

    3年前 (2017-06-29)
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