NASA·APOD每日天文一图2022.6.22 [超高清]

梦幻的星云，人类前的文明

Ten thousand years ago, before the dawn of recorded human history, a new light would have suddenly have appeared in the night sky and faded after a few weeks. Today we know this light was from a supernova, or exploding star, and record the expanding debris cloud as the Veil Nebula, a supernova remnant. Imaged with color filters featuring light emitted by sulfur (red), hydrogen (green), and oxygen (blue), this deep wide-angle view was processed to remove the stars and so better capture the impressive glowing filaments of the Veil. Also known as the Cygnus Loop, the Veil Nebula is roughly circular in shape and covers nearly 3 degrees on the sky toward the constellation of the Swan (Cygnus). Famous nebular sections include the Bat Nebula, the Witch's Broom Nebula, and Fleming's Triangular Wisp. The complete supernova remnant lies about 1,400 light-years away. 

一万年前，在有记载的人类历史出现之前，夜空中会突然出现一道新光，几周后就会消失。今天，我们知道这道光来自一颗超新星或爆炸的恒星，并将膨胀的碎片云记录为面纱星云，这是一颗超新星遗迹。这张深广角照片采用滤色镜拍摄，滤色镜以硫（红色）、氢（绿色）和氧（蓝色）发出的光为特征，经过处理后可以去除恒星，从而更好地捕捉到面纱上令人印象深刻的发光细丝。面纱星云也被称为天鹅座环，形状大致呈圆形，在天空中覆盖近3度，朝向天鹅座（天鹅座）。著名的星云部分包括蝙蝠星云、女巫扫帚星云和弗莱明的三角星云。完整的超新星遗迹位于1400光年之外。