as "more mature than most 'adult' science fiction". P. Schuyler Miller praised the novel as "very smoothly and logically put together", although he noted that it lacked the level of "elaboration of background detail" that he expected from Heinlein. Surveying Heinlein's juvenile novels, Jack Williamson characterized Between Planets as "mov[ing] the series still farther from its juvenile origins toward grownup concerns". Although describing the plot as "pretty traditional space opera", he praised the novel for its "ably drawn" characters, its "well-imagined" background, and its "story told with zest". Williamson also noted that Heinlein closed the novel "with a vigorous statement of his unhappiness with 'the historical imperative' leading to the loss of individual freedom as governmental organizations grew". Cartoon Between Planets was serialized in Boys' Life magazine in 1978 as a monthly cartoon series. The story took some liberties — for instance, the "Dragons" of Venus were portrayed as humanoids and the planets' names were changed — but the spirit of the story was relatively faithful. References External links 1951 American novels 1951 science fiction novels Children's science fiction novels American science fiction novels Novels by Robert A. Heinlein Space opera novels Novels set on Venus Novels first published in serial form Works originally published in Blue Book (magazine)