Jon McBride, retired NASA astronaut, speaks to visitors in front of the Mars rover concept, developed by vehicle designers, the Parker Brothers, with advice from NASA, during the Smithsonian Institution’s National Air and Space Museum Mars Day, Friday, July 21, 2017 in Washington. The Mars rover concept is currently on an East Coast tour from its home base at the Kennedy Space Center Visitor’s Center in Florida, and is designed to engage and educate the public by demonstrating the types of features and equipment a future human exploration vehicle may need. Photo Credit: (NASA/Aubrey Gemignani)