2 books · Ages 8–12 · Chapter Books
Our Universe is a 2-book series for ages 8–12 by Stacy McAnulty. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, Save the People! Halting Human Extinction and Where Are the Aliens? The Search for Life Beyond Earth are great first picks.
No particular order needed — browse and pick what catches your eye.