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.
麥永剛說，在中國工作其實極具挑戰性，只有享受挑戰的人才會覺得有趣。中國每個月的驚喜從不間斷。
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