美国国家航空航天局NASA每日一图(天文)-2017年7月27日

2017 July 27

A Sagittarius Triplet
Image Credit & Copyright: Josep Drudis
Explanation: These three bright nebulae are often featured on telescopic tours of the constellation Sagittarius and the crowded starfields of the central Milky Way. In fact, 18th century cosmic tourist Charles Messier cataloged two of them; M8, the large nebula above and left of center, and colorful M20 near the bottom of the frame. The third emission region includes NGC 6559, right of M8 and separated from the larger nebula by a dark dust lane. All three are stellar nurseries about five thousand light-years or so distant. Over a hundred light-years across the expansive M8 is also known as the Lagoon Nebula. M20's popular moniker is the Trifid. Glowing hydrogen gas creates the dominant red color of the emission nebulae. In striking contrast, blue hues in the Trifid are due to dust reflected starlight. The colorful composite skyscape was recorded with two different telescopes to capture a widefield image of the area and individual close-ups at higher resolution.

2017年7月27日

射手座 Triplet
Image Credit& 版权所有: Josep Drudis
说明: 这三颗明亮的星云通常以人马座星座和中央银河拥挤的星空的望远镜旅行为特色。事实上,18世纪的宇宙旅游者 查尔斯·梅西耶(Charles Messier)编目了两个; M8,中心的上方和左侧的大星云,以及框架底部附近的彩色M20。第三个发射区域包括 NGC 6559,M8的右侧,并与较大的星云由黑暗的尘土通道分开。所有这三个都是恒星苗圃,大约五千光年遥远。横跨广阔的M8超过一百光年也被称为泻湖星云。M20的流行绰号是Trifid。发光的氢气产生排放星云的主要红色。与之形成鲜明对比的是,“三光辉”中的蓝色色调是由于灰尘反射的星光。 用两个不同的望远镜记录了丰富多彩的复合材料,以更高的分辨率拍摄该地区的广角图像和个人特写。

评论已关闭