Ventura Saga (in 3 vol.) by Kate Ling

The Loneliness of Distant Beings

Even though she knows it's impossible, Seren longs to have the sunshine on her skin. It's something she feels she needs to stay sane. But when you're floating through space at thousands of kilometres an hour, sometimes you have to accept there are things you cannot change.
Except that the arrival of Dom in her life changes everything in ways she can barely comprehend. For a while he becomes the Sun for her; and she can't help but stay in his orbit. Being with him flaunts every rule designed to keep their home in order, but to lose him would be like losing herself.
In the end they must decide what is most important: loyalty to the only home they've ever known, or to each other?

The Glow of Fallen Stars

Seren and Dom have fled their old lives on board spaceship Ventura in order to be together. They crash-land on a beautiful, uninhabited planet, which at first seems like paradise.
There is no one to answer to … but no one to ask for help. And with each new day comes the realisation of how vulnerable they truly are.
This planet has secrets – lots of them. Uncovering them could be the key to survival, but at what cost?

The Truth of Different Skies

Bea feels trapped. Having never left her small town and with no money or anyone to rely on, she faces the inevitable future of a dead-end job - forced to survive, rather than live.

When a message arrives from space, a mission is planned to travel to its source. Bea knows she has to be chosen to go, no matter what it takes, even though it means leaving Earth forever. Her life has to matter.

Except she didn't plan on falling in love before she left . . .