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.
《围城》人物分析：知识分子的时代困局
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Последние новости。夫子对此有专业解读
「我常常想要逃跑，但沒地方可以跑。」他向BBC中文形容自己的債務困境。