ISS astronaut Soichi Noguchi shared this amazing photo via Twitter on 22 February 2010: this is the plasma trail produced by Space Shuttle Endeavour as it was returning from the ISS (after delivering Cupola, from where the photo was taken) and entered Earth‘s atmosphere with speed of Mach 25. "Space Shuttle Endeavour making S-turn during atmospheric re-entry," wrote Noguchi on Twitpic page caption @Astro_Soichi: "The first time it was photographed from Space Station Cupola. Priceless."