Oasis — Rene David Rivero

After a cosmic catastrophe ages the Sun, humanity struggles a thousand years to escape the dying, withering Earth. Rocketships and other, radical breakthroughs enable only a fraction to migrate to the stars: only those who are the empowered, the well-to-do, and the fertile.

Conan and Rhonda were shaped by their societies. As opposites - he, the migrant and she, the beautiful and forbidden farmer's daughter - they weren't supposed to be together. Weren't, anyhow, until happenstance beyond their control left them behind....