PLANETARY PROTECTION: MICROBIAL ANALYSIS OF THE EXOMARS 2016 SPACECRAFT AND ITS HOUSING CLEAN ROOMS
2016
Spacecraft are built and tested in highly controlled cleanrooms to ensure the cleanliness required
for full functionability of sensitive components and scientific (life-detection) instruments. In
case, a spacecraft targets planets and moons of astrobiological interest, additional requirements
with respect to microbial cleanliness have to be fulfilled. These requirements are defined by the
COSPAR planetary protection policy, to which all space-faring nations adhere. Avoiding the
failure of the current and future missions by the introduction of terrestrial microbial contami-
nation is of upmost concern. In particular, the bioburden, including the heat-shock surviving
(spore-forming) cultivable microbial community is in the focus of space agencies due to its
potential capability to survive a space
ight. For ExoMars 2016, controlled cleanrooms have
been used for the assembly, integration, and testing of the spacecraft. In our study, we have
investigated the microbial bioburden and biodiversity of a newly built cleanroom in Turin via
ESA standard assay (bioburden detection), different cultivation assays targeting oligotrophs,
anaerobes and alkaliphiles, and molecular methods, including next generation sequencing and
quantitative PCR. The aim was to document the changes in the composition of the micro-
bial community from the commissioning on during the 3 years of utilisation when more and
more spacecraft parts and components, ground support equipment and people populated the
cleanroom. Our study showed that, during operation, the clean room harbored a very specific
microbial community, composed of mainly human-associated microorganisms. In general, the
detectable levels of bioburden and other microorganisms were very low and did not raise any
concern. In this presentation, we will present details of the microbial analysis of the ExoMars
2016 mission during the three years before launch in March 2016.
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