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.
(三)办理本社区居民的公共事务和公益事业,开展便民利民的社区服务活动,关心关爱老年人、儿童、残疾人和困难居民;
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