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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2024年12月24日 星期二 新京报
大约20分钟后，17位村民陆续涌到山沟里，将那头牛五花大绑，横竖穿插了三根木桩，再在牛身上绑两条长绳，绳头各自由几个男人牵引往上拽。为确保每个人都能搭把手，男人们之间挤得密密实实，以至于我都看不见被围在中间的牛。