The Mars of several of the books (Red Planet, Between Planets, The Rolling Stones, and Time for the Stars) has indigenous, intelligent (even dangerous) life, but not necessarily the same Martians in each book.
Additionally, the plural form juveniles may refer the Heinlein juveniles, a series of sci-fi books written by that author for young people.
Star-Lord continued to appear in Marvel Preview, with writer Chris Claremont revamping the character and using science fiction adventure stories like the Heinlein juveniles for inspiration.
Robert A. Heinlein | Virginia Heinlein | Juveniles | Heinlein juveniles | ''T. r. capensis'' with two juveniles in Krishna Wildlife Sanctuary | Robert A. Heinlein Award | Cover art for Heinlein's ''Time for the Stars |