Fresh air for astronauts by " ESA " European Space Agency.
Astronauts living aboard the International Space Station need the same things we do to survive: food to eat, water to drink, and oxygen to breathe. These supplies are shipped from Earth via cargo ships. But imagine you are an astronaut traveling to a distant planet in a spaceship from the future. You would be too far from Earth to receive supplies. How would you get what you need to survive? To help solve this problem, scientists are working on an experiment aimed at producing oxygen on the International Space Station.
Did you know that when humans breathe, we inhale oxygen and exhale carbon dioxide? Plants do the opposite: When they convert light into energy (a process called photosynthesis), they absorb carbon dioxide and release oxygen. Therefore, having plants in space could be a great way for astronauts to recycle air. The scientists' experiment consists of discovering whether photosynthesis works the same in space (under microgravity conditions) as it does on Earth. 
Knowing how plants carry out photosynthesis will help astronauts of the future.
To do this, they have sent a special type of bacteria called Arthrospira to the European Columbus laboratory on the space station, which carries out photosynthesis just like a plant. Once there, they put it in a device called a photobioreactor, which is a cylinder with lots of light. Arthrospira absorbs the carbon dioxide exhaled by astronauts and transforms it into oxygen. As an added bonus, this bacteria can easily be converted into something called spirulina, which is very nutritious and can be fed to astronauts!
Now, the big question is whether being in space can change the effectiveness of these plants in producing oxygen. Does being in a microgravity environment help them be more efficient or could it cause strange side effects? Can radiation from space help or harm the process? We will soon have the answer. 
Arthrospira can be converted into spirulina, which is very nutritious. Would you like to try it?
Perhaps, in the future, you could be an astronaut traveling to another world breathing air recycled by plants.
Source from the official website of ESA (European Space Agency) go see >>>