四边形星团

A bright nebula occupies the center of the frame. The nebula is complex but roughly tan in the center and red around the edges. In the center are four bright blue stars. Please see the explanation for more detailed information.
明亮的星云占据了画面的中心。星云结构复杂，中心大致呈棕褐色，边缘呈红色。中心有四颗明亮的蓝色恒星。有关更多详细信息，请参阅说明。