The document discusses the International Space Station (ISS) and explores it as a way for humans to live in space. The ISS is a space station in low Earth orbit that serves as a microgravity laboratory for research. It contains several modules including Zarya, Zvezda, Harmony, Tranquility, Unity, Destiny, Columbus, and Kibo. The ISS orbits approximately 250 miles above Earth and involves cooperation between several space agencies.