What is the ISS?

• A large habitable satellite 

• It constantly orbits Earth (90 minutes)

• It is a microgravity laboratory located in space

• It's a collaborative project involving multiple space agencies, mainly NASA (US), Roscosmos (Russia), JAXA (Japan), ESA (Europe), and CSA (Canada). 

Overall, the project is very special, as it is a symbol of collaboration from countries all over the globe

References: nasa.gov