Oh, sure, human astronauts will be on board Space Shuttle Endeavour’s STS-134 mission set to launch Monday. But so will five microscopic life forms: Water Bears, also known as Tardigrades (shown above); the bacteria Deinococcus radiodurans and Bacillus subtilis; and the archaea Haloarcula marismortui and Pyrococcus furiosus. More about “Shuttle LIFE” here, via the Planetary Society.

Tardigrades image via Google Knol.