While the enormity of the universe is hard to conceptualize, this visual graphic created by computer scientist Neal Agarwal helps provide some context. The Size of Space allows users to click through a series of images that categorize elements of space and space exploration by size. The site begins with an astronaut, and sizes-up from there, taking users on a journey through space shuttles, stations, asteroids, planets, black holes, nebulae, and galaxies, concluding with the end of the observable universe. The interactive methodology and clear visuals provide an engaging way for users to interact with space themes, making it a desirable supplemental tool for teachers completing space related units. The site concludes with a quote from Carl Sagan: "Somewhere, something incredible is waiting to be known." This quote encompasses the theme of the site, an invitation to explore mystical aspects of space in an effort to better understand beyond what we can directly see.