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'We weren't really looking for' it: Astronomers accidentally discover 2 supernovas that exploded from a single star system in cosmic first
天文学家在著名的水母星云 (IC 443) 旁边发现了一颗超新星遗迹,有证据表明它们都是两颗恒星的残骸,这两颗恒星在分别爆炸之前曾相互绕转。