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.
2024年12月25日 星期三 新京报
。safew官方版本下载对此有专业解读
Москвичей предупредили о резком похолодании09:45
Guards in pattern matching → nested if