25 Years in Orbit: Science, Innovation, and the Future of Exploration 

NASA and its partners have been supporting humans who continually live and work in space since November 2000. A truly global enterprise, the International Space Station has been visited by more than 290 people from 26 countries and a variety of international and commercial spacecraft. This unique microgravity laboratory has hosted more than 4,000 experiments carried out by more than 5,000 researchers from 110 countries. The space station also facilitates the growth of a commercial market in low Earth orbit for research, technology development, and transportation of crew and cargo.

After a quarter of a century of human presence in orbit, the station remains a symbol of international cooperation and a testing ground for humanity’s next giant steps towards the Moon and, ultimately, Mars.

Microgravity environments aboard the space station enable discoveries beneficial to life on Earth and prepare humans for deep space missions. NASA’s Human Research Program (HRP) aims to understand the changes astronauts face aboard the orbital outpost and develop interventions to keep crews healthy before, during and after flight.

Astronauts aboard the station exercise about two hours a day to protect bone density, muscle strength and the cardiovascular system, but the longer they stay in microgravity, the harder it can be for the brain and body to readjust to the gravitational pull. After months in orbit, returning astronauts often describe Earth as heavy, noisy and strangely still. Some people re-acclimatize within a few days, while others take longer to fully recover.

Through studies conducted by HRP, scientists are tracking these changes and testing solutions, from improved exercise programs to medical monitoring and nutritional strategies. The results inspire new medical technologies, while teaching scientists how the human body adapts to long-duration spaceflight – knowledge that helps keep astronauts healthy on future missions.

The space station continues to be a critical platform for honing the skills, technology and understanding that will prepare humanity to return to the Moon with NASA’s Artemis campaign and travel to Mars and beyond.

Because space presents an entirely new physical environment with a distinct set of challenges, the orbiting laboratory is in a unique position to support research and preparations not possible on Earth. This includes:

• Master techniques for basic tasks like drinking water, sleeping, exercising, and handling various materials.

• Develop solutions to the changes and challenges induced by microgravity for the human body.

• Testing reliable technologies and autonomous ecosystems needed for deep space travel, from life support systems to on-orbit agriculture and 3D printing of materials.

• Refine techniques and procedures for collecting and analyzing data and images.

Learn more about how the space station has enabled significant progress in our journey to the final frontier.

The space station’s first decade was one of construction. The second decade moved from initial studies to full use of the orbiting laboratory. We are now in the decade of results.

With nearly 25 years of experiments conducted aboard the station, more breakthroughs are materializing than ever before. These scientific discoveries and technological advances benefit humanity on Earth, contribute to the growth of the low-Earth orbit economy, and help prepare for future exploration of the Moon and Mars.

Innovations include:

• Advances in x-ray technologies, developed to create a space station telescope, are helping to unlock the mysteries of our universe while improving medical devices on Earth.

• Data on temperature changes that have been used to reduce heat absorbed by urban surfaces, reduce fire risks, and help farmers water their fields efficiently.

• Demonstrations of robotic technologies with the potential to alleviate repetitive motion and other work-related stressors.

• Development of a small ultrasound unit for crew health monitoring which has since been adapted to provide diagnostic care in remote areas of Earth.

Find more information about the space station’s benefits to humanity here.