International Space Station

The International Space Station, at 109 meters long, hosts continuous human habitation since 2000, with over 3,000 experiments completed—far exceeding the average orbital lab's output of 500 studies over a similar timeframe. It has supported 242 astronauts from 19 countries, a collaboration that outperforms #6 Curiosity's solo Mars mission by fostering 20 years of international teamwork and microgravity research. Among its contributions, 45 peer-reviewed studies on bone density loss have informed astronaut health protocols for future deep-space missions.