When astronomers talk about the "habitable zone," they mean the shell around a star where the temperatures are right for liquid water.
当天文学家谈及“可居住区”时，他们指的是恒星以外温度适于液态水存在的空间层。
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Infrared images from the Spitzer Space Telescope (yellow, red, and green) expose a surrounding shell of dust and gas that's being lit up as the material streams through a nearby star cluster.