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Inside the Cupola, NASA astronaut Chris Cassidy, an Expedition 36 flight engineer, uses a 400mm lens on a digital still camera to photograph a target of opportunity on Earth some 250 miles below him and the International Space Station.

Titan Occults Rhea | Gordan Ugarkovic | Flickr

A visualization of Earth's South Pole and Antartica from NASA. Posted by Stuart Rankin.

AS17-143-21932 | Flickr - Photo Sharing!

Dione mosaic April 11, 2015 (ir grn uv) | by 2di7 & titanio44