Some good books containing planet information for young children include "Planet Kindergarten" by Sue Ganz-Schmitt, "Star-Stuff" by Carl Sagan, "Big Machines Fly!" by Catherine Veitch and "The First Space Missions" by Megan Cooley Peterson, all of which are available from Amazon. Another good book for young children is the rhyming "Rosie Revere, Engineer" by Andrea Beaty, which is a sequel to "Iggy Peck, Architect."
Some good books for children aged 8 to 12 include "The Race to the Moon: An Interactive History Adventure" by Allison Lassieur, a novel by Cathy Camper, "Lowriders in Space," a storybook by Claudia Alexander, "Windows to Adventure: Venus, the Morning Star" and "Professor Astro Cat's Frontiers of Space," which is written by Dominic Walliman and illustrated by Ben Newman. All of these books can be purchased from Amazon, as well as local independent bookstores.