The Stars Too Fondly: A Novel - Emily Hamilton

In her breathtaking debut—part space odyssey, part sapphic rom-com—Emily Hamilton weaves a suspenseful, charming, and irresistibly joyous tale of fierce friendship, improbable love, and wonder as vast as the universe itself.
So, here's the thing: Cleo and her friends really, truly didn't mean to steal this spaceship.
They just wanted to know why, twenty years ago, the entire Providence crew vanished without a trace. But then the stupid dark matter engine started all on its own, and now these four twenty-somethings are en route to Proxima Centauri, unable to turn around, and being harangued by a snarky hologram that has the face and attitude of the ship's missing captain, Billie.
Cleo has dreamt of being an astronaut all her life, and Earth is kind of a lost cause at this point, so this should be one of those blessings in disguise that people talk about. But as the ship gets deeper into space, the laws of physics start twisting, old mysteries come crawling back to life, and Cleo's initially combative relationship with Billie turns into something deeper and more desperate than either woman was prepared for.
Lying somewhere in the subspace between science fantasy and sapphic rom-com, The Stars Too Fondly is a soaring near-future adventure about dark matter and alternate dimensions, leaving home and finding family, and the galaxy-saving power of letting yourself love and be loved.