How astronauts survive in space

The station recycles around 90 percent of the water used by astronauts.

Electrolysis splits water into hydrogen and oxygen to provide breathable air.

Scrubbers containing zeolite filters remove excess carbon dioxide from the air.

Redundancy includes bottled oxygen, solid fuel oxygen generators, and backup air systems.

Because the station is an open system for food, all meals must be sent from Earth.