What is the name of the book series co-authored by Hawking and his daughter Lucy?

The book series co-authored by Stephen Hawking and his daughter Lucy began with “George’s Secret Key to the Universe.”

Published in 2007, the first book follows George Greenby, a boy who discovers a computer named Cosmos that can open windows and portals into outer space. The adventure story introduces children to planets, stars, atoms, black holes, and other ideas from astronomy and cosmology.

Lucy Hawking was the principal writer of the series, while Stephen Hawking contributed scientific expertise and helped shape its explanations. Christophe Galfard, a former doctoral student of Stephen Hawking, also worked on the first book. The project was designed to make theoretical physics approachable through fiction rather than through a conventional textbook.

The first novel launched a series that continued with George’s Cosmic Treasure Hunt in 2009, followed by books about the Big Bang, an unbreakable code, a blue moon, and the ship of time. A common mix-up is choosing The Universe in a Nutshell, which is a separate popular-science book by Stephen Hawking.