Cornelius Comet's Astroadventures

Cornelius and Anna, two unlikely astronauts, go on the journey of a
lifetime. After launching into space on their homemade rocket, they
complete lots of exciting missions around the solar system.

A Bedtime Stories - read & tell Storyworld, published by Little Lights Studio.
Storyworld includes the following stories:
The First Boy on the Moon
Meterorite Mayhem and a Mars Mission
Dive to the Depths of the Icy Sea
The Clouds of Titan
Cornelius Comet's Comet

The kids will absolutely love it!