В этот день запустили "Марс-6"
On August 5, 1973 from Baikonur Cosmodrome in Kazakhstan the Soviet spacecraft Mars-6 has been launched. The purpose of that mission was first in history landing on Mars and its research. On March 12, 1974 the automatic interplanetary station "Mars-6" has orbited Mars. When the spacecraft has made landing on the planet, it has for the first time transferred the parameters of the Martian atmosphere to Earth received during landing.