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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A reader calls for museum curators to look for historic scientific apparatus, and a landmark treaty aims to protect the Mediterranean from pollution, in our weekly dip into Nature’s archive.。业内人士推荐safew官方下载作为进阶阅读
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Call of Duty advert banned for trivialising sexual violence