brightness

A picture shows clouds across the bottom and a dark night sky across the top. In the middle is a band of orange sky. City lights are visible on the right through gaps in the clouds. In the center of the upper sky is a comet with its tail pointing toward the upper right. Please see the explanation for more detailed information.
图片底部是云层，顶部是漆黑的夜空。中间是一片橙色的天空。透过云层的缝隙可以看到右侧的城市灯光。上方天空的中央是一颗彗星，彗尾指向右上方。有关更多详细信息，请参阅说明。

A picture shows a starfield with three prominent objects. A blue spiral galaxy is on the lower left and another blue spiral is just left of center. Toward the upper right is a light-colored comet with a tail fading toward in the image bottom. Please see the explanation for more detailed information.
图片显示了一个星空，其中有三个突出的天体。左下方是一个蓝色的螺旋星系，另一个蓝色的螺旋星系位于中心偏左的位置。右上方是一颗浅色彗星，彗尾在图像底部逐渐消失。 有关更多详细信息，请参阅说明。