'They are essential': How smoke detectors are evolving
"All the bigger artists seem to go for London," Elise said.
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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.，详情可参考搜狗输入法下载
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