INTERNATIONAL SPACE STATION — NASA astronaut Scott Kelly posted a photo of a UFO to his Twitter account, and alien theorists are having a field day.\r<br>\r<br>Aboard the International Space Station, Expedition 45 Commander Scott Kelly of NASA discussed life and research aboard the orbital laboratory with .\r<br>\r<br>Join ESA astronaut Samantha Cristoforetti as she shows how astronauts on the International Space Station keep clean. From soap to water and cutting your .\r<br>\r<br>Former International Space Station commander Suni Williams has lifted the lid on how astronauts aboard the orbital module go to the toilet. Personnel aboard .
