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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Why Denmark is dumping Microsoft Office and Windows for LibreOffice and Linux
中共中央办公厅近日印发《关于在全党开展树立和践行正确政绩观学习教育的通知》。2月24日，中央党的建设工作领导小组召开会议，学习贯彻习近平总书记关于树立和践行正确政绩观学习教育的重要讲话和重要指示精神，研究部署学习教育工作。