ISS040-E-87351 (1 Aug. 2014) --- This sunset shot, photographed by an Expedition 40 crew member on the International Space Station, shows polar mesospheric clouds only as a thin bright line ? far above the lowest, yellow-brown weather layer of the atmosphere (known as the troposphere) when the space station was flying over southern Ukraine on Aug. 1, 2014.
Photographer Alex Gerst
Date August 1, 2014