The Fleet of Stars — Poul Anderson

In Fleet of Stars, Poul Anderson brings pack the wildly colorful Anson Guthrie, his iconoclastic hero from Harvest of Stars. The staid, somber people of Earth are not only dependent on technology, they are all but ruled by machine intelligence. Suspecting a conspiracy to suppress humankind's last vestiges of freedom, Guthrie begins a dangerous journey across the realm of the comets, the asteroids, and the stars themselves--willing to risk his life to preserve humanity's ability to roam the universe.