solar books publishing
Hello, I'm looking for a book of science fiction young adults published before 1976. In the book a young man a kind of graduate school survey area and is sent to another solar system in search of his spacecraft brother disappeared. His own ship was damaged upon arrival. The solar system has a large asteroid belt (not planets?) Inhabited by hard shelled creatures floating around that can shoot laser beams. He is accompanied by a young girl, I think. I think the book begins with him playing a baseball game thinking about the physics involved in catching a baseball that his fly to him. Any leads on an author or title would be greatly appreciated. Thank you very much.
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