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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.，详情可参考下载安装 谷歌浏览器 开启极速安全的 上网之旅。
Starring: Jared Keeso, Tasya Teles, Blair Lamora, Keilani Elizabeth Rose, Ryan McDonell, Camille Sullivan, Jonathan-Ismaël Diaby, Terry Ryan, and Harlan Blayne Kytwayhat
露西·吉爾德（Lucy Gilder），BBC事實查核