The International Space Station is a big building built by many countries where very important scientific research is done, but you won’t find it on any world map. It’s in outer space!
This very special building is about the size of a football field, though the spaces where people live and work aren’t very large. The largest section of the space station was built by Japan and is only about the size of a bus!
The space station travels around the earth about 16 times every day. It's just far enough away that gravity doesn't yank it down to the ground, but it's still about 200 miles high! The only way people can get up there is by rocket or space shuttle! The Astronauts that visit study all sorts of things from how different chemicals act in outer space (where there is no gravity!) to how people interact with each other while spending a long time together in a tight space! You might be surprised, but one of the most common things astronauts study from the space station is the Earth! They watch our weather and they watch our planet as it changes. They can see things we can’t because we’re too close to the ground. Imagine going all the way to space to just study the Earth!