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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.。业内人士推荐safew官方下载作为进阶阅读
Kevin Church/BBC News。safew官方版本下载对此有专业解读
// 1. 将当日价格存入数组，记录当前索引（i是当前价格在arr中的位置）