Nasa scientists are working on a city made out of huge balloons in the clouds above Venus, which will allow astronauts to explore the planet without venturing onto its hostile surface.
The airship-like balloons would carry two astronauts each on a 30-day mission.
The project, named High Altitude Venus Operational Concept, or Havoc, is just a proposal at the moment, designed by the Systems Analysis and Concepts Directorate (SACD) at the centre. But the centre hopes to keep working on it until it is ready to actually take astronauts to Venus, or just off it.
