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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.
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18歲時,她憑藉空中技巧與U型場兩金成為自由式滑雪最年輕奧運冠軍;隨後再奪坡面障礙技巧銀牌,成為單屆冬奧首個摘得三枚獎牌的選手。。业内人士推荐WPS官方版本下载作为进阶阅读
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