Galaxy Mapper: The Luminous Discoveries of Astrophysicist Helene Courtois
Allie Summers
Illustrated by Sian James
Candlewick Press/mit Kids Press
Ages 6-10
Available November 18, 2025

From the time she was a young girl in a remote village in the French Alps, Helene Courtois has looked up at the moon, and wondered what could lay beyond it. As she grows older, she finds herself chasing this question all the way into a career as a cosmographer, mapping the vast universe beyond the moon. Her maps of the galaxy eventually uncovers the existence of a supercluster of galaxies named Laniakea — perhaps finally answering her question of what lays past the moon.

Summers follows Courtois from childhood through to her discovery of Laniakea, with the moon as a constant companion in her journey. The sky dominates James’ illustrations on every page, always keeping the story oriented towards the stars. The narrative masterfully weaves together a cohesive story of Helene’s life, bringing her discoveries back to the maps and experiences of her childhood.

Future astronomers and cosmographers-in-training will be drawn to this book’s exploration of space, and humanity (and Helene’s) journey towards mapping it. Courtois’ mission of inspiring girls to pursue science means there is also ample inspiration for girls in STEM in its pages.