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Between Planets is a 1951 science fiction novel by Robert Heinlein.

The novel is the story of a young Earthling named Don Harvey who leaves his ranch school on Earth to be with his scientist parents on Mars. He gets caught up in the Venusian war of independence when his ship is captured by Venusian colonials. He is nearly blown up with the captured ship, but released at a space station because of his determination to go to Mars.

This novel marks Heinlein's first benign depiction of extraterrestrials. A Venusian dragon by the name of Sir Isaac Newton befriends Don on board the ship from the space station to Venus. He turns out to be a genius physicist collaborating with Don's parents on advanced scientific principles that the colonials use to win the war with the government on Earth.