Researchers from an American university also found bacteria living within the space station, although these are probably the same sort of bugs you'd find in an ordinary home here on terra firma.
The research comes days after a Russian cosmonaut revealed that bacteria had been found on the outside of the space station.
Getting to explore space sounds pretty darn cool, but the experience comes with many sacrifices. A modern-day trailblazer, Kelly's time on the International Space Station is already proving invaluable to scientists studying the effects of long-term space travel on the human body.
"We were also pleased to see is that the diversity was fairly high, indicating that it did not look like a "sick" microbial community", said the paper's lead author Jenna Lang. "It is probably no more or less gross than your living room".
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It isn't yet possible to look at bacteria coming from space, he said. Being as limited as they are, since, well, they're in space, it has been a craving that has been left unsatiated.
At present the batch is on a commercial supply ship and pulled out the flatbread, tomato sauce, cheese, pepperoni, olives, olive oil, anchovy paste and pesto in order to celebrate the first ever cosmic pizza party with much grandeur and zeal.
Study co-author Jonathan Eisen, a professor of medical microbiology and immunology, and of ecology and evolution, at UC Davis, says the findings from Project MERCURRI studies are important to understanding the differences between the microbial communities on Earth and the ISS.