Living in Space

The international space station is a habitable place where astronauts can live in space for a certain time . It was built by 15 countries in 1998 at the cost of  150 billion US dollars . They live and work on the space station to survive while staying in space . In the space station they do not have gravity ,the gravity in space is called micro gravity. They also study how space affects living things and how different it is to earth . 

https://en.wikipedia.org/wiki/List_of_International_Space_Station_spacewalks-(CC BY-SA 3.0)