Thin Blue Line by Fragile Oasis on Flickr.
Via Flickr:
“I noticed right along the horizon it looked as if someone had taken a royal blue crayon and just traced along Earth’s horizon. And then I realized that blue line, that really thin blue line, was Earth’s atmosphere. And that was all there was of it. And it is so clear from that perspective how fragile our existence is.” - Sally Ride
Photo credit: NASA
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