Brandon Fibbs · @bfibbs
18th Apr 2014 from TwitLonger
"Earth's upper atmosphere—below freezing, nearly without oxygen, flooded by UV radiation—is no place to live. But last winter, scientists from the Georgia Institute of Technology discovered that billions of bacteria actually thrive up there. 20 percent of what they had assumed to be just dust or other particles was alive. Earth, it seems, is surrounded by a bubble of bacteria."
http://www.popsci.com/science/article/2013-06/bacteria-33000-feet