而天文学家知道这些云状物最终将凝结成大小行星。
Barnard 163有一条长度以光年记的侧翼，其内部肯定要比外部寒冷，这才让气体能够在其中凝结，最终形成恒星。
With a wing span measured in light years, Barnard 163's insides are surely colder than its exterior, allowing conditions where gas can clump and eventually form stars.
最终，水蒸气凝结成水滴空气冷却而形成的云。
Eventually, water vapor in the cooled air condenses into the droplets that form clouds.
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