Thurber's World

Eleven-year-old Thurber has never known a life outside the metal walls of the space station he calls home. After Earth was destroyed, the space station became the last refuge for humanity. But now, the station's systems are failing, and hope is running out.
When the brilliant scientists aboard the station discover a wormhole that can transport someone back in time, they pin their last hope on a daring mission: sending Thurber to the past to stop the invention of the device that caused Earth'...