EARTH'S SPACE ORBIT - JUN 5, 2012 (Ungraded): Polar Mesospheric Clouds on the Horizon. Time lapse from unaltered photos taken by astronauts. HighRes NASA JPEGs muxed into PhotoJPEG video without re-encoding and post-processing. This clip retains 100% of original image quality including camera artifacts. ISS flying in Earth's orbit from western Iraq to western Uzbekistan. By focusing on the limb of the Earth at night with the sun illuminating it, the crew was able to capture some movement to these mysterious clouds. (av22583u)

NASA Johnson Space Center