There have been many stories and legends throughout history about ancient astronauts visiting Earth. Some believe that these aliens were responsible for helping to build the Egyptian pyramids, while others think they may have given humans the technology to create guns and explosives. The most famous story of an ancient astronaut is probably the one about the emperor who came down in a UFO. The emperor was said to be a great leader who possessed advanced knowledge of science and technology. He was also said to have had the ability to fly and to control the weather. Many people believe that the emperor was actually an alien, and that he came to Earth in order to help humanity develop and progress. Whether or not this story is true, it is certainly an intriguing idea.