Eternigy

They were built at the dawn of the exile from Earth – the bio-planes – artificial continents floating in a great archipelago, created so humanity might survive out in space. For centuries they drifted away from each other until, isolated and scattered beyond reach, they were left to evolve as a myriad of faraway worlds.
On Gemma, oldest of the bio-planes, a pilot, a legislator, and a soldier are touched by a mysterious power that connects all human life and promises to bridge the vast distances. Guided by the secretive cult that discovered it, the three explorers set out on a journey across the known worlds. But their quest arouses jealous governments and dark forces that covet their new source of power.