Space vehicles 99 Space (Architecture) 95 Public spaces 90 Space and time 82 History 60 Banach spaces 58 Social aspects 54 City planning 46 Architecture 42 Space in economics 39 Design and construction 33 Philosophy 32 Space perception 32 Astronautics 27 Hilbert space 24 Linear topological spaces 23 Airplanes 21 History and criticism 21 Space (Art) 21 Space flight 21 Cities and towns 20 Vector spaces 20 Exploration 19 Function spaces 19 Political aspects 19 Architecture and society 18 Metric spaces 18 Human geography 17 Design 16 Materials 16