Life support

A ship's crew and passengers require: - Oxygen

 - Crew can survive in spacesuits, so long as they are refilled with oxygen periodically, but civilians can't wear spacesuits and require an atmosphere.

- CO₂ removal (if an atmosphere exists). - Food - Water - Sewage removal is not yet required (as of Alpha 14), but presumably will be at some point.

Oxygen, food, and water can all be purchased (or retrieved from post-combat debris), and CO₂ and sewage can be sold.

With the right equipment, the player can recycle CO₂ and sewage back into oxygen, food, and water. Research can increase how much is recycled.

Additionally, waste water can be harvested from ice comets with mining lasers and then purified. Oxygen can be produced from water with an Oxygen Maker, though this risks using up the water supply if not monitored.