光回显：宇宙如何重放过去
短讯：光回显（light echoes）让天文学家能从不同方向"重放"古老恒星爆发，观测隐藏尘埃、超新星及过去事件。信息量很低，仅为一个科普名词解释级别的引子，没有具体案例、数据或可讨论的技术细节。
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