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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 scientists fear Emperor penguins' annual moult may be killing them
Swigert flicked the switch. It should have been a routine procedure but the command module, Odyssey, shuddered. Oxygen pressure fell and power shut down.