Final answer:
The Moon landing happened in the Modern Era on July 20, 1969, during the Apollo 11 mission. This event marked a significant milestone in human history as it was the first time humans set foot on another celestial body.
Step-by-step explanation:
The Moon landing happened in the Modern Era. Specifically, it occurred on July 20, 1969, during the Apollo 11 mission. This event marked a significant milestone in human history as it was the first time humans set foot on another celestial body. The Moon landing paved the way for further space exploration and scientific discoveries. The last human left the Moon in December 1972, concluding the Apollo program's lunar exploration, which has since become a defining moment of the twentieth century.