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死亡恒星编织出天空之幕
网状星云是一颗质量比太阳重约20倍的大质量恒星经历超新星爆炸后留下的残骸,目前我们所观测到的景象大约在发生这场爆炸后的一万年。哈勃太空望远镜自30多年前就开始对这片超新星残骸进行观测,科学家们对比过去的数据与最新的数据,逐渐揭示气体云团和细丝状结构的 ...
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