Since the 1940s, thousands of UFO sightings have been reported in the United States. Some of these incidents have been so alarming, that they prompted a military investigation. These are some of the most terrifying close encounters investigated by the US government.
In July 1969 humans landed on the Moon for the first time, as part of the Apollo 11 mission. In 1972, however, Apollo 17 became the last manned mission to the Moon after NASA canceled the Apollo program. But why did NASA stop going to the Moon?