According to the current level of scientific knowledge and technology, modern people could not travel back to ancient times or the past. This was because time and space were interconnected. The transformation of time and space would lead to a series of complex physical and chemical reactions that could lead to unpredictable results. Although the scientific community had not proven this, there were some novels and movies that described modern people traveling back to ancient times or past times. These stories usually explored the possibility and feasibility of time travel through fictional plots and characters. For example," Time Machine " was a classic science fiction novel. It described a scientist who invented a time machine that allowed him to go back in time. In the novel, he met people like him who tried to stop the use of time machines because they thought time travel was impossible. There were also novels and movies that depicted modern people traveling back to ancient times or past times through certain means. These means might be through magic, mysterious powers, or special equipment. However, these methods were all fictional and had no scientific basis.