Never has the definition of science fiction been so apt as for this interesting story which, starting from plausible, when not known, scientific bases, goes up in the most daring regions of the imagination, up to where man now does not even dare to think of reaching: stars. Walt Hansman, protagonist of the book, and his friend Don of him, are two nice young cadets who have just graduated from the Schiaparelli Academy, of Mars: year 2150! And when they believe that a holiday period begins for them, after having obtained the diploma, here they are, for mysterious reasons, called back to Earth. Upon arrival, the mystery is revealed: they have been chosen to be part of the staff responsible for the implementation of the most daring project ever devised by man: the construction of a device that is baptized starship because it is destined to reach the remote ones. regions of space, which, according to current scientific theories, are considered unreachable by man. But physicist Hansman, Walt's father, has developed a theory which, when implemented, allows man to exceed the speed of light. And then we follow the construction of the starship, the dramatic test on Pluto, the departure for Operation Centaur, the arrival on the very distant planet, so remote and so much like the old Earth. But the emotions are not over: who are the mysterious civilized Ainsath, the bronze giants that populate the planet? We do not want to take the surprise away from the reader by revealing it to him now, but we would like to bet that he would never be able to guess it. And we're also willing to bet that he won't easily forget the brave, simple Walt, the smart Dr. Hansman, Captain Garver, who has something of the old pirates, sweet Marge ... and, not least, Cosmo, the cat of edge, important and fun character of this clever book.