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Beyond the cloud's unusual shape, scientists see the nebula as a freeze-frame in the life of a star facing its final act. Elderly stars shed their outer layers in bursts, creating shells of gas and dust that expand. By observing the nebula at different wavelengths, researchers can sort out what material was molted first, how fast the star is losing mass, and which phase of decline Webb has caught.
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但他又很传统。他跟我和阿妈都说过很多次，女孩子读太多书没用，结婚生子才是正事。早晚我都是要嫁出去的，成为别人家的人，家里为我花太多钱，不划算。可他也会打电话叮嘱我，不要总伏在案头，有空出去看看绿色，对眼睛好；不要熬夜，能休息就多休息。这些话，我工作了多少年，他就说了多少年。