スティーヴンホーキング博士による児童書。ジョージと隣家の科学者エリック、娘アニーの宇宙へのアドベンチャーを通して、理論物理学が分かる。邦訳・宇宙への秘密の鍵 さくまゆみこ訳 岩崎書店より2008年2月出版。ISBN 978-4-265-82011-5。3部作の第１巻。New in paperback. Hardcover was published in 2007. Stephen Hawking and his daughter Lucy explain the universe to readers of all ages. George's parents, who have always been wary of technology, warn him about their new neighbors: Eric is a scientist and his daughter, Annie, seems to be following in his footsteps. But when George befriends them and Cosmos, their super-computer, he finds himself on a wildly fun adventure, while learning about physics, time, and the universe. With Cosmos's help, he can travel to other planets and a black hole.