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相对论能让我们回到过去？
source link: https://tech.sina.com.cn/d/i/2019-02-19/doc-ihrfqzka7094961.shtml
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来源：环球科学在爱因斯坦相对论面世以前，所有关于时间旅行的故事都只能算是天马行空的幻想。现在，除了在太空轨道高速飞行的宇航员在穿越时空，连微观尺度下的μ子也在穿越时空。不过他们只能向未来穿越。未来，我们能否穿越到过去？或许，我们需要一种完全
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