哈勃发现宇宙云的银色光芒

This image taken with the NASA/ESA Hubble Space Telescope showcases the emission nebula NGC 2313. Emission nebulae are bright, diffuse clouds of ionized gas that emit their own light.

The bright star V565 (center of the image) highlights a silvery, fan-shaped veil of gas and dust, while the right half of this image is obscured by a dense cloud of dust. Nebulae with similar shapes were once called “cometary nebulae” because the star with an accompanying bright fan looked like a comet with a bright tail.

The language that astronomers use changes as we become better acquainted with the universe, and astronomical history is littered with now-obsolete phrases to describe objects in the night sky, such as “spiral nebulae” for spiral galaxies.

Text credit: European Space Agency (ESA)
Image credit: ESA/Hubble, R. Sahai

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这张由美国宇航局/欧洲航天局哈勃太空望远镜拍摄的照片展示了发射星云NGC 2313。发射星云是明亮的、弥漫的电离气体云，它们自己会发出光。

明亮的恒星V565(图像的中心)突出了一个银色的扇形气体和尘埃的面纱，而图像的右半部分被稠密的尘埃云遮蔽。具有类似形状的星云曾经被称为 “彗星星云”，因为伴随有一个明亮扇形的恒星看起来像一个带有明亮尾巴的彗星。

随着我们对宇宙越来越熟悉，天文学家使用的语言也在变化，天文史上有很多现在已经过时的短语来描述夜空中的物体，比如螺旋星系的“螺旋星云”。

文字来源：欧洲航天局(ESA)
图片来源：欧洲航天局/哈勃望远镜，R. Sahai