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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Netflix to buy Warner Bros film and streaming businesses for $72bn
According to Welsh legend, Prince Madoc is believed to have discovered America in 1170 after setting sail from north Wales, over 300 years before Christopher Columbus arrived.。91视频对此有专业解读