This research looks at questions concerning environmental sustainability and ethical expansion into outer space, and how these issues are imagined through fiction, material and conceptual architectures. I ask how we imagine modes of human expansion and habitation into low earth orbit, the Moon and Mars, looking through the lens of literature and culture, as well as architecture, treating the latter as an imaginary of future living. I work in the context of emerging issues of space debris, resource mining and corporate expansion onto other planets, and look at how these concerns are imagined in the books of authors such as Kim Stanley Robinson, Ian McDonald, and Samantha Harvey, and the films of directors such as Ridley Scott and Pella Kagerman. I ask what care means in outer space: how we care fore extraterrestrial environments, how we care for Earth while undergoing un-Earthing through expansion, and what the work of care and maintenance looks like in high-tech environments.