Electric-blue "noctilucent" clouds hovering on the edge of space

Electric-blue "noctilucent" clouds hovering on the edge of space
They hover on the edge of space. Thin, wispy clouds, glowing electric blue. Finally a great view of rarely seen noctilucent clouds.

Photo via Jeff Williams
Read & learn:
http://science.nasa.gov/science-news/science-at-nasa/2003/19feb_nlc/

#naturalphenomena   #noctilucentclouds   #ISS   #NASA   #space   #science