Inspired by the recent gift of a yoghurt making kit* that involves re-hydrating a mix that evidently contains freeze dried yoghurt making bacteria, I have become interested in the fact that you can freeze dry bacteria in the first place.
Isn't that a little surprising?
My self education, and yours, can perhaps begin with this paper.
I also am now wondering whether life spread throughout the universe via the accidental dispersal of freeze dried yoghurt mix from an alien spaceship that exploded. Or perhaps they just littered and threw the empty foil packet out the hatch after making a batch of Xerthian Noobleberry. It's a theory...
* (yes I know, Tim, you can make yoghurt just by breeding more of it from shop bought yoghurt.)