The ISS is a permanently crewed space laboratory in low Earth orbit that astronauts use for science, technology testing, and international cooperation. It helps researchers study microgravity, radiation, Earth observation, and how long-term spaceflight affects the human body.

Quick Scoop

  • It is basically a floating lab where astronauts run experiments that are hard or impossible to do on Earth.
  • It helps test space technology and systems for future missions to the Moon and Mars.
  • It also supports education and global teamwork between several space agencies.

What astronauts do

Astronauts on the ISS do experiments in biology, physics, materials science, and space medicine. They also monitor Earth, study space weather, and investigate how the body changes in space, such as muscle loss and bone loss.

In one line

If you want the simplest answer: the ISS is a space station that lets people live and work in orbit to do research and prepare for deeper space exploration.

If you want, I can also explain how the ISS stays in orbit or what astronauts do there day to day.