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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.。关于这个话题,WPS官方版本下载提供了深入分析
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Mahjong, Sudoku, free crossword, and more: Play games on Mashable。旺商聊官方下载对此有专业解读
Gaby Hinsliff may be right to link the current lack of starter jobs to recent increases in minimum wage and national insurance costs for employers (Do you remember your first crappy job? Today’s young people would wish for half your luck, 20 February). But there’s more to it.