星系合并

Two spiral galaxies are pictured on the left and right. They galaxy on the left is smaller. Both show red lanes of dust in their spiral arms. Please see the explanation for more detailed information.
左图和右图为两个螺旋星系。左侧星系较小。两个星系的旋臂中都有红色尘埃带。有关更多详细信息，请参阅说明。