There are 3 books in the Astronaut Academy series. The newest book is Splashdown which came out in 2021.

1
Zero Gravity

Book cover of Zero Gravity
Hakata Soy's past won't stay in the past!

This former space hero is doing his best to keep his head down at Astronaut Academy. Things aren't going so great, though. The most popular girl in school has it in for him. His best friend won't return his calls. And his…
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2
Re-entry

Book cover of Re-entry
Hakata Soy still has a lot to learn!

It's a new semester at Astronaut Academy and everyone is excited for the Fireball championship-especially Hakata's cranky roommate, Tak Offsky. But lurking in the shadows is a shape-shifting, heart-stealing monster, and it might just knock the Fireball team out of the competition!…

3
Splashdown

Book cover of Splashdown
Heroes like Hakata Soy don't take vacation!

It's summer vacation for the students of Astronaut Academy, and Maribelle Mellonbelly is throwing the best party ever on Beach Planet? Yes! But tensions heat up fast when Hakata Soy's arch rival, Rick Raven, arrives. And soon the whole planet is heating up-with…