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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第十条 仲裁实行一裁终局的制度。裁决作出后，当事人就同一纠纷再申请仲裁或者向人民法院提起诉讼的，仲裁机构或者人民法院不予受理。