It's called the International Space Station (ISS), and a rotating astronaut crew has occupied it since 2000. The work of those astronauts has yielded some incredible scientific insights.
Astronaut is not a profession where you get to go home at the end of the day though. One ticket from Earth to the ISS costs about $70 million, so normally each crew lives and works on the station for a six-month shift.
Right now NASA astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko are in the middle of a year-long shift aboard the ISS. They'll be the first humans to spend a consecutive year living in space.
But what is it like to actually live on the ISS?