Explore and learn

Space guides for curious explorers

Find clear, source-linked guides to planets and space science. Each one is written for young explorers and the adults learning alongside them, with the science kept separate from our fictional adventures.

Planet guides

Planet 1 · The inner Solar System

Mercury: the small planet with a very long day

Discover Mercury's orbit, long solar day, temperature extremes, polar shadows and the spacecraft that explored it. Includes NASA sources and a crater-shadow activity to try together.

Read the Mercury field guide