Astronauts on board the International Space Station (ISS) took this picture of noctilucent clouds (NLCs) near the top of Earth's atmosphere on July 13, 2012.
Astronauts on board the International Space Station (ISS) took this picture of noctilucent clouds (NLCs) near the top of Earth’s atmosphere on July 13, 2012. Credit: NASALink to associated news item