In the 1999 gazetteer "The Stars and Planets of Frank Herbert's Dune: A Gazetteer" (1999), Joseph M. Daniels estimates the distance from Earth in light-years (ly) for many "Dune" planets, based on the real-life distances of the stars and planetary systems referenced by Frank Herbert when discussing these planets in the glossary of the novel "Dune". Though Herbert used the names of actual stars and planetary systems in his work, there is no documentation supporting or disputing the assumption that he was, in fact, referring to these real-life stars or systems. "The Science of Dune" (2008) analyzes and deconstructs many of Herbert's concepts and fictional inventions.