Producer: Alice Lipscombe-Southwell
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A so-called "planetary nebula" is a confusing misnomer because these clouds have nothing to do with planets. As a medium-size star nears the end, it puffs out into a red giant — about 100 to 1,000 times its original size — eventually engulfing the space around it, including any nearby worlds.
2026-02-28 00:00:00:0本报记者 各地区各部门各单位认真部署谋划、精心组织实施——