Space, also known as outer space, refers to the expansive vacuum between Earth and other celestial bodies. As a challenging environment that was once unreachable by humans, space has long been an inspiration for religion, science, popular culture and technological advancements. Common elements related to space include space ships, astronauts, satellites, planets, and figures from popular culture including a variety of alien races and other cosmic characters. The following collections of celestial objects, technologies, and humanoids related to space have been put together to illustrate the variety of influences on our perception of design for outer space.