Or vacuumships? https://www.nasa.gov/directorates/spacetech/niac/2017_Phase_I_Phase_II/Evacuated_Airship_for_Mars_Missions/ https://www.nasa.gov/directorates/sp

Or vacuumships? https://www.nasa.gov/directorates/spacetech/niac/2017_Phase_I_Phase_II/Evacuated_Airship_for_Mars_Missions/ https://www.nasa.gov/directorates/spacetech/niac/2017_Phase_...