Contamination Forces Removal of Space Station Greenhouse

Gardens are always a source of surprises. After three weeks of steady growth in space under the watchful eye of the ESA astronaut Paolo Nespoli, the baby space plants of the Greenhouse in Space project have found a new - and unexpected - travelling companion.

The International Space Station (ISS) ecosystem is particularly a delicate one. Whereas some residuals don't harm much the earthly plants or humans, the balance of the closed systems present in the Station should not be compromised. It is known that spaceflight reduces the ability of the crew's immune systems to fight off possible infections and once safety experts confirmed the presence of unexpected particles in the greenhouse, an unavoidable decision was made to carefully remove the greenhouse from the ISS, thus avoiding any probability of causing any harm to the astronauts.

The Arabidopsis plants, already having proved themselves as a hardy growers in space, seemed to grow very well despite the uninvited hitch-hiker on board. Paolo was the first one to remark that simple procedures on Earth are extremely complex and possibly dangerous in weightlessness. "Part of the experiment was indeed a success: we were able to grow the plants and observe them." Even though some experiments can go wrong, Paolo said, "This is a lesson to be learned that we can leave to the future astronauts. I'm sure they will get even better at it."

Romain with greenhouses inside the Mars500 facility

The Greenhouse in Space education project moves on and encourages participating students throughout Europe to continue their experiments and monitor their plants even more closely. Now it is time to compare their greenhouses with the martian ones, as the crew of Mars500 found four of these little greenhouses packed in their lander module with all other cargo. Now they are carefully growing the same plants in their spacecraft-like modules and the results are coming in - have a look at the video below.

After three weeks

The Greenhouse in Space education project started on 17 February and is being carried out by more than 800 school children throughout Europe. The first online lesson is now posted on ESA educational web pages, where the results of all the participants can be checked and compared. The Project's group on Facebook has discussions and photos. Teachers can follow the lesson online and should send their class results to the HSF education team at the end of the project.

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