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课程 5
Deep space: black holes
📖 课程
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🎯 测验——选择翻译
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✅ 本课已完成
A black hole is a star squeezed so hard that even light cannot escape. Around it, time runs slower — not science fiction, science!
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星云
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黑洞
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超新星
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脉冲星
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望远镜
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银河系
🕳 The first photo of a black hole — 2019, telescopes of the whole planet photographed it together!