星云由发光的气体组成，其间夹杂暗色的尘埃。这种明暗相间的组成标示了银河系缓慢的漩涡运动。
Clouds of stars are glowing gas, with patches of darkening dust, mark the slow-changing spiral patterns of the Galaxy disk.
星云由发光的气体组成，其间夹杂暗色的尘埃。这种明暗相间的组成标示了银河系缓慢的漩涡运动。
Clouds of stars are glowing gas, with patches of darkening dust, mark the slow-changing spiral patterns of the Galaxy disk.
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