男孩的父亲是天文学家，夜观星象时发现了一颗小型彗星。本来打算正式申请彗星发现证明的，但是父亲突然因病逝世，而这项成果也随之被父亲的同事霸占。 为了维护父亲的成果，小男孩决定和他的四个好友开展寻找彗星是他父亲发现的证据之旅......
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