caosyciencia is an initiative of the Instituto de Astrofísica de Canarias (IAC) for the dissemination of Astronomy and other related sciences. Since it was founded in 2002, it has sought to spread interest in science in an enjoyable way and defends the use of the scientific method as a tool to access knowledge. Its contents are elaborated by active researchers and scientific journalists. Project coordinator: Luis A. Martínez Sáez Responsible for publication: Annia Domènech Web technician: Nacho Martínez Multimedia technician: Anthony Baillard Scientific Advisor: Alfred Rosenberg Original page design: Patrick Sole Original logo design: Gotzon Cañada This publication is not responsible for the opinions expressed by the authors.