S121-E-07932 (15 July 2006) --- A setting sun and the thin blue airglow line at Earth's horizon were captured in this image photographed by an STS-121 crewmember aboard the Space Shuttle Discovery.
S121-E-07932 (15 July 2006) --- A setting sun and the thin blue airglow line at Earth's horizon were captured in this image photographed by an STS-121 crewmember aboard the Space Shuttle Discovery.