Episode Description from the Publisher
有艘飞船，叫旅行者一号，飞了快50年，马上就要冲出太阳系了。这期聊这些不用回来、替人类远行的使者：旅行者带了一张"金唱片"，录了地球的声音和图像，打算给外星人看；新视野号飞了九年才到冥王星，拍回那颗带心形冰原的矮行星；帕克探测器更猛，2025年直接贴着太阳日冕拍了最近距离的实景。它们靠"引力弹弓"借行星的力加速，一毛钱燃料不花。我们给外星人寄了张金唱片，可要是真有人收着了，他们能听懂咱们是啥样吗？还是说，这封信本就是写给我们自己看的？
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