Life on other planets Books for Kids
16 books in life on other planets. Every book rated for reading level and content intensity.
Life on other planets books for kids span a wider readiness range than parents usually expect. The same genre category contains gentle picture books and high-intensity middle-grade novels — Lexile and grade-level scores measure text complexity, not what's actually in the story. A life on other planets title appropriate for a confident 8-year-old reader could still cover themes a sensitive 12-year-old isn't ready for.
Across HootRated's 16 life on other planets titles, books span Grade 2–7. About 88% are rated Gentle or Mild — safe picks for sensitive readers and kids reading ahead of their emotional readiness. 0% sit at the Intense or Very Intense end. Average content intensity is 1.8/5.
Use the intensity badges (green → red, low → high) to filter by emotional readiness rather than just age. For deeper detail on how we rate, see our rating methodology.
Is there life in outer space?
Robert Kraske
Is there life in outer space?
Robert Kraske
The nearest fire
Cherry Wilder
The nearest fire
Cherry Wilder
Is anybody out there?
Heather Couper
Is anybody out there?
Heather Couper
A voyage to Arcturus
David Lindsay
A voyage to Arcturus
David Lindsay
A Martian Named Zoom
John Hammond
A Martian Named Zoom
John Hammond
Is there life on other planets?
Rosalind Mist
Is there life on other planets?
Rosalind Mist
The Bartokk Assassins (Star Wars Episode I Adventure, Game Book 2)
Dave Wolverton, Ryder Windham
The Bartokk Assassins (Star Wars Episode I Adventure, Game Book 2)
Dave Wolverton, Ryder Windham
Star Wars: The Empire Strikes Back - Junior Novel
Various
Star Wars: The Empire Strikes Back - Junior Novel
Various
Involution Ocean
Bruce Sterling
Involution Ocean
Bruce Sterling
Spaceballs
Robert Lawrence Stine
Spaceballs
Robert Lawrence Stine
Stepsister from the Planet Weird
Francess Lin Lantz
Stepsister from the Planet Weird
Francess Lin Lantz
Kipton and the Ovoid (Kipton , Vol 2)
Charles L. Fontenay
Kipton and the Ovoid (Kipton , Vol 2)
Charles L. Fontenay
AsterDesert (The AsterPlanet Chronicles, Vol 3)
Monica Simmons
AsterDesert (The AsterPlanet Chronicles, Vol 3)
Monica Simmons
AsterOcean (The AsterPlanet Chronicles, vol 4)
Monica Simmons
AsterOcean (The AsterPlanet Chronicles, vol 4)
Monica Simmons
AsterCity (The AsterPlanet Chronicles , Vol 5)
Monica Simmons
AsterCity (The AsterPlanet Chronicles , Vol 5)
Monica Simmons
Jake in Space
Candice Lemon-Scott
Jake in Space
Candice Lemon-Scott
Questions parents ask about life on other planets books
- What are the best life on other planets books for kids?
- HootRated catalogs 16 life on other planets children's books spanning Grade 2–7. Each is rated on reading level and content intensity. The picks above are sorted by quality signals — hook factor, discussion potential, and content appropriateness.
- Are life on other planets books appropriate for sensitive readers?
- 14 books (88%) are rated Gentle or Mild — safe for sensitive readers. 0 (0%) are rated Intense or Very Intense. Average intensity is 1.8/5. Filter by intensity badge to match your child's emotional readiness.
- What reading level are life on other planets books?
- Life on other planets books in our catalog span Grade 2–7. The typical reading level lands around Grade 5. Reading level measures text difficulty — separate from content intensity, which measures emotional weight. The two often don't track together for gifted readers — the Gifted Kid Paradox.