
Bon Voyage STS-134 and its bacterial payload.
They will be testing transpermia — can extremophiles survive interplanetary voyages?
For example, D. radiodurans can survive radiation levels 3000x that which is lethal to most organisms. While its DNA is blasted into smithereens, it has mechanisms to stitch it all back together again. (more from NASA)
(more Endeavour photos)
UPDATE: the top photo is by Trey Ratcliff and is not NASA public domain as I had been led to believe. You can see the cool backstory of how he captured it here

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