An "expandable habitat" refers to a living space that can be made larger or more spacious when needed. It is flexible and can be expanded or contracted based on the requirements or number of inhabitants. Full definition
Bigelow Aerospace has already tested two other expandable habitats in orbit, without human occupants. (scientificamerican.com)
It's a result of a $ 17.8 million contract the company signed with NASA in 2012 to develop and test expandable habitat technology for potential use in deep space. (fortune.com)
Assuming everything goes to plan, BEAM will be attached to the Tranquility Node of the station, and will become the first expandable habitat occupied by humans in space. (scientificamerican.com)