RT @RonBaalke: On this day in 1965, Mariner 4 flew by #Mars & took the 1st closeup images of that planet. https://t.co/LowvsIioxd
RT @RonBaalke: On this day in 1965, Mariner 4 flew by #Mars & took the 1st closeup images of that planet. https://t.co/LowvsIioxd