NASA Administrator Charles Bolden introduces former NASA astronaut Scott Kelly during an event at the United States Capitol Visitor Center, Wednesday, May 25, 2016, in Washington. Photo Credit: (NASA/Bill Ingalls)

NASA Administrator Charles Bolden introduces former NASA astronaut Scott Kelly during an event at the United States Capitol Visitor Center, Wednesday, May 25, 2016, in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA astronaut Scott Kelly speaks during an event at the United States Capitol Visitor Center, Wednesday, May 25, 2016, in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA astronaut Scott Kelly speaks during an event at the United States Capitol Visitor Center, Wednesday, May 25, 2016, in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA astronaut Scott Kelly speaks during an event at the United States Capitol Visitor Center, Wednesday, May 25, 2016, in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA astronaut Scott Kelly speaks during an event at the United States Capitol Visitor Center, Wednesday, May 25, 2016, in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA astronaut Scott Kelly speaks during an event at the United States Capitol Visitor Center, Wednesday, May 25, 2016, in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA astronaut Scott Kelly speaks during an event at the United States Capitol Visitor Center, Wednesday, May 25, 2016, in Washington. Photo Credit: (NASA/Bill Ingalls)

Former NASA astronaut Scott Kelly speaks during an event at the United States Capitol Visitor Center, Wednesday, May 25, 2016, in Washington. Photo Credit: (NASA/Bill Ingalls)