Ole R mers Venner
Science, Astronomy, History, People - Ole Rømer Museet. Copenhagen museum about his works in astronomy.
http://www.oleroemer.dk/
History
Johannes Kepler
Science, Astronomy, History, People - Johannes Kepler. Includes detailed biography, online links, outlines of some of his works, quotes, and reading list.
http://www.johanneskepler.com
The Carl Sagan Portal
Science, Astronomy, History, People - Carlsagan.com. Official page with articles, including the Baloney Detection Kit.
https://www.carlsagan.com/