“It seemed that the nearby and mysterious planet was resorting to tricks to hide the secrets kept beneath its cover of clouds. As the probe drew nearer, Venus’ gravitational field increased its speed. The Doppler effect altered the wavelength of the ...

The Zond program was one of two lunar exploration programs conducted by the Soviet Union to investigate the Moon and its vicinity. The program began in 1964 and ended in 1979. The early Zond’s 1-3 were originally designed for planetary exploration, w...