20 years. Today we celebrate 20 years of humans living in space, international collaboration, experiments & research to benefit humanity, stunning images, and so much more. As a global endeavor, over 240 people from 19 countries have visited the iss, a unique microgravity laboratory, which has hosted more than 3,000 research investigations from scientists in over 100 nations. Swipe through to see some of our favorite views from the orbiting office captured over the years. Credit: NASA #SpaceStation20th #space #nasa #spacepics #iss