[Photo] Astronauts need to carry guns in space?

Did you see a model of China's space station on the Spring Festival Gala this year? Have you ever thought about a question: astronauts really encounter aliens in space, and they encounter terrorists in aliens? In this case, astronauts need to be able to defend themselves, so do astronauts need to carry guns in space? Actually, there are astronauts carrying guns in space! Only it's not for aliens, it's for when the re-entry module lands.