Mark and Scott Kelly are identical twins who were...  ...m. They are the only siblings ever to both fly in space . Mark Kelly flew the space shuttle for ten years , then retired in order to take care of his wife....  ...ake care of his wife. Scott Kelly spent an entire *stro...

NASA Astronaut Scott Kelly is back on earth along...  ...nko after they both spent 340 consecutive days in space on the ISS. Now Kelly will undergo tests to see h...  ...he ISS. Now Kelly will undergo tests to see how a year in space affected his physiology as compared to his i...