National Air and Space Museum Celebrates “Mars Day!” July 21 Press Releases National Air and Space Museum Celebrates “Mars Day!” July 21 adminDC July 21, 2017 0 SOURCE: NATIONAL AIR AND SPACE MUSEUM Monday, July 17, 2017 – 8:30am Media Inquiries Alison Mitchell, 202-633-2376,... Read More Read more about National Air and Space Museum Celebrates “Mars Day!” July 21