Isso pode ser " The Solarians ", de Norman Spinrad, originalmente publicado em 1966.
Por wikipedia
The novel takes places centuries in the future when humanity has colonized many star systems. Another race, the Duglaari or "Doogs" is slowly conquering human systems, herding the inhabitants into barren areas where they simply starve to death. The two races have approximately equal technologies, and space battles are decided by superior numbers, with the Doogs always having the advantage.
The colonists are awaiting the emergence of saviors from "Fortress Sol", the Solar System, which has been closed off to all ships since the early days of the war. Before sealing themselves off with billions of space mines and robot ships, the Solarians, as they are known to the colonists, promised to re-emerge with an answer to the numeric superiority of the Duglaari.
In appearance the Duglaari are roughly humanoid except for large eyes, fur, and bat-wing ears which move to express emotion
The Solarians take Palmer to Fortress Sol, behind all its defenses, and tour the system so he can see Earth for the last time. The Duglaari fleet arrives and penetrates the defences, unleashing massive bombardments that destroy all the habitable planets. When all seems lost, a stardrive in a ship on Mercury is activated, and Sol explodes, annihilating the Doog fleet. Suddenly the Solarian scheme becomes clear to Palmer. By goading the Doogs into risking a large part of the fleet, they have destroyed so many ships that from now on, the colonists will always have the advantage. Palmer's humiliation was a necessary part of the deception. He believes that Earth sacrificed itself to save the colonies.
