Astronaut Scott Kelly will retire from NASA next month

 After his nearly year-long mission on the International Space Station (ISS) and 20 years of service with NASA, Astronaut Scott Kelly will retire from the agency, effective April 1st. “This year-in-space mission was a profound challenge for all involved, and it gave me a unique perspective and a lot of time to reflect on what my next step should be on our continued journey to help further…