Researchers have tested the endurance of microbes to Martian conditions by launching them into the Earth's stratosphere, as it closely represents key conditions on the Red Planet. This study by NASA and German Aerospace Center scientists paves the way for understanding not only the threat of microbes to space missions but also the opportunities for resource independence from Earth.
Some microbes on Earth could temporarily survive on the surface of Mars, finds the study, published in Frontiers in Microbiology,
"We successfully tested a new way of exposing bacteria and fungi to Mars-like conditions by using a scientific balloon to fly our experimental equipment up to Earth's stratosphere," reports Marta Filipa Cortesão, joint first author of this study from the German Aerospace Center, Cologne, Germany.
"Some microbes, in particular spores from the black mold fungus, were able to survive the trip, even when exposed to very high UV radiation."
Microbes in outer space
Understanding the endurance of microbes to space travel is vital for the success of future missions. When searching for extra-terrestrial life, we need to be sure that anything we discover has not just travelled with us from Earth.
"With crewed long-term missions to Mars, we need to know how human-associated microorganisms would survive on the Red Planet, as some may pose a health risk to astronauts," says joint first author Katharina Siems, also based at the German Aerospace Center.
"In addition, some microbes could be invaluable for space exploration. They could help us produce food and material supplies independently from Earth, which will be crucial when far away from home."
Creating a Martian atmosphere
Many key characteristics of the environment at the Martian surface cannot be found or easily replicated at the surface of our planet, however, above the ozone layer in Earth's middle stratosphere the conditions are remarkably similar.
"We launched the microbes into the stratosphere inside the MARSBOx (Microbes in Atmosphere for Radiation, Survival and Biological Outcomes experiment) payload, which was kept at Martian pressure and filled with artificial Martian atmosphere throughout the mission," explains Cortesao.
"The box carried two sample layers, with the bottom layer shielded from radiation. This allowed us to separate the effects of radiation from the other tested conditions: desiccation, atmosphere, and temperature fluctuation during the flight. The top layer samples were exposed to more than a thousand times more UV radiation than levels that can cause sunburn on our skin."
"While not all the microbes survived the trip, one previously detected on the International Space Station, the black mold Aspergillus niger, could be revived after it returned home," explains Siems, who highlights the importance of this ongoing research.
"Microorganisms are closely-connected to us; our body, our food, our environment, so it is impossible to rule them out of space travel.”