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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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Kosmos 482, which launched in 1972 on a mission to Venus, never made it out of Earth's orbit and instead broke into four pieces that have been circling the planet for more than five decades.。业内人士推荐同城约会作为进阶阅读
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