An alternative phrase for "space people" could be "extraterrestrial beings." This wording suggests that the individuals in question are not from Earth and have arrived from another planet or galaxy. Another phrase that could be used is "alien life forms," which emphasizes the unfamiliar and mysterious nature of these beings. "Cosmic creatures" is another option that highlights the powerful and awe-inspiring nature of those who come from beyond our world. Additionally, "interstellar travelers" implies a sense of curiosity and exploration, indicating that these individuals have likely arrived in our solar system with a sense of wonder and discovery.