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
关于进一步落实航经阿曼湾、霍尔木兹海峡、波斯湾海域船舶信息报送工作的通知