How many A True Book: Space Science books are there?

There are 3 books in the A True Book: Space Science series by Gregory L. Vogt, for ages 4-11.

A True Book: Space Science Books in Order — Wonderlit

A True Book: Space Science is a 3-book series for ages 4–11 by Gregory L. Vogt. Each book stands alone — start anywhere.

Start anywhere — each book stands alone.

That said, Asteroids and Pluto are great first picks.

No particular order needed — browse and pick what catches your eye.