水手6号和水手7号探索这颗红色星球
Lost in the glare following the Apollo 11 Moon landing, two intrepid robotic spacecraft flew by Mars in the summer of 1969 and returned photographs and a trove of scientific information. Launched on Feb. 25 and March 27, respectively, Mariner 6 and 7 arrived at Mars just five days apart despite being launched a month apart. After a flight of 156 days from Ea...