NASA Space Station View of Noctilucent Clouds

Expedition 47 Flight Engineer Tim Peake of the European Space Agency photographed rare, high-altitude noctilucent or "night shining" clouds from the International Space Station on May 29, 2016. Noctilucent clouds form between 76 to 85 kilometers (47 to 53 miles) above the Earth’s surface, near the boundary of the mesosphere and thermosphere. via NASA http://www.nasa.gov/image-feature/space-station-view-of-noctilucent-clouds