The Secret of the Ninth Planet (Version 2) - Donald WOLLHEIM

An alien race has put a station on Earth and other planets in order to steal the rays of the sun, possible causing the sun to nova within two years. Burl Denning, a high school student, is the only person who has the power to stop the alien project. Can he and the crew of the experimental space ship Magellan act in time to save the earth? (Summary by Tom Weiss)