Understanding the universe and space in all its complexity has consumed the passions of many people over the millennia. With an interest in bringing material from the world of scientific cosmology to the web-browsing public, the American Institute of Physics and the Center for History of Physics have created this website. The site is divided into two primary areas, titled “Ideas” and “Tools”. In the “Ideas” section, visitors can read essays about the development of cosmology from the time of the Greeks all the way up to the present. And moving over to the “Tools” section, visitors can learn about important related events, including the invention of the telescope and the golden era of refractors. The site is rounded out with a collection of links for further reading, such as the “Cosmology 101” site created by NASA and a 1955 National Academy of Sciences briefing on cosmology.