The Sun Thief

The year is 2450. After graduating from the Galactic Preservation Academy, 12-yr-old Earthling Manny Adams is thrust into the role of Chief Cosmic Controller for the Moon when his Commander dies in a suspicious moonquake. Jupiterian Cira Blondt is the Chief Cosmic Controller for the Sun, a role she's wanted since she grew her baby body vents. The two share a unique telepathic bond.
Together they engage in a battle of wits and courage when Reginald Daschell III, their nemesis from the Academy, concocts a plan to destroy their reputations and proclaim himself a hero to win the respect of his powerful father. Dasch captures the Sun's Control Center and stops sunlight from reaching the Moon. Without solar power to run the Moon's equipment, it's losing the ability to rotate, weakening its gravitational pull on the Earth.
Manny and Cira have just 48 hours to stop Dasch before the Moon crashes into the Earth, exploding it into a gigantic mass of space debris.