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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“现行SAE分级是法律和责任的划分，非技术鸿沟。L3本质上是限定ODD运行范围的L4，因此跳过在技术上是个伪命题。“在公众号“电厂”的一篇文章中，原博世车载产品线负责人易强认为，L3是“缩小范围的L4”，区别主要是在法律法规上。法律人为限定了L3的使用范围。这才是当下L3和L4最大的不同。