Above, a cover for She Liked Them Young by Rick Nathan, who was also author of Six for Love. This is a crossover sleaze entry, touching on lifeguards, suburbia, and older women with teenaged boys all at once. It’s from 1965 for Softcover Library with uncredited art.
1959—Dark Side of Moon Revealed
The Soviet space probe Luna 3 transmits the first photographs of the far side of the moon. The photos generate great interest, and scientists are surprised to see mountainous terrain, very different from the near side, and only two seas, which the Soviets name Mare Moscovrae (Sea of Moscow) and Mare Desiderii (Sea of Desire).