羅伯特·海因萊因(1907～1988)，世界科幻“三巨頭”之一，美國最具影響力的科幻作傢。他以高超的敘述技巧、精巧的科幻構思、極具時代感的激進思想，以及對美國曆史和文化獨特的科幻化闡釋，贏得瞭無數讀者的喜愛，被譽為“美國現代科幻小說之父”。截至目前，他的作品已被譯成數十種語言，在全世界範圍內廣為流行，受到中國、日本以及俄羅斯讀者的熱烈歡迎。 海因萊因一生著作頗豐，獲奬無數，是第一位被世界科幻協會授予“科幻大師”稱號的科幻作傢。其代錶作主要包括：《雙星》《進入盛夏之門》《星船傘兵》《異鄉異客》《嚴厲的月亮》等。

The rollicking adventures of the Stone family on a tour of the Solar System. It all started when the twins, Castor and Pollux Stone, decided that life on the Lunar colony was too dull and decided to buy their own spaceship and go into business for themselves. Their father thought that was a fine idea, except that he and Grandma Hazel bought the spaceship and the whole Stone family were on their way out into the far reaches of the Solar System, with stops on Mars (where the twins got a lesson in the interplanetary economics of bicycles and the adorable little critters called flat cats who, it turned out, bred like rabbits; or, perhaps, Tribbles...), out to the asteroids, where Mrs. Stone, an M.D., was needed to treat a dangerous outbreak of disease, and even further out, to Titan and beyond. Unforgettable Heinlein characters on an unforgettable adventure.