No, NASA astronaut Scott Kelly did not tweet a picture of a UFO

More info at ufoofinterest.org (please use Google Translate):
http://www.ufoofinterest.org/2015/11/19/l-astronauta-della-nasa-scott-kelly-avrebbe-mostrato-in-un-tweet-un-ufo-dalla-iss/

Credits:
- Scott Kelly | @StationCDRKelly
- Olivia D'Souza | @Olivia_Dsouza

NASA images:
http://eol.jsc.nasa.gov/SearchPhotos/photo.pl?mission=ISS045&roll=E&frame=107821

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