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**Results and Discussion**  The vast majority of the bacteria (45/48) behaved very similarly in space and on earth (Table 1, Figure X). Only three bacteria showed a significant difference in the two conditions, however two of them were affected by contamination and so discarded from analysis. The remaining candidate was _Bacillus safensis_, collected at the Jet Propulsion Laboratory (JPL) on a Mars Exploration Rover in 2004. This species, originally isolated and characterized at JPL... SOMETHING INTERESTING. In this experiment, _Bacillus safensis_ grew to a final density of ??% higher in space than on the ground, with very little variation between replicates. The genome sequence of this strain, Bacillus safensis JPL-MERTA-8-2 has just been published (REF) and may contain clues as to why this strain behaved so differently in space.  HYPOTHESIS WHY?