article_snippet: (CNN)NASA Scott Kelly Scott Kelly has started a trip to the record books.
article_snippet: Scott Kelly lifted off Friday aboard the ISS.
article_snippet: Scott Kelly will stay twice as long as any U.S. astronaut has ever stayed on the International Space Station, giving scientists a chance to study how the human body responds to long-duration space flights.
article_snippet: Scott Kelly, 51, hopes to break the record for the longest mission on the space station set by NASA astronaut Michael Lopez-Alegria and Russian cosmonaut Mikhail Tyurin.
article_snippet: Kelly, 51 spent over seven months on the ISS -- from September 18, 2006, to April 21, 2007.
highlights_snippet: Scott Kelly aims to set a record for longest stay on the International Space Station .
  