Sponsored by Friends and Partners in Space and edited by Mark Wade, this site is a bit hard on the eyes, but it has few peers in terms of the sheer mountains of material it offers on spaceflight by all nations of the world. There is so much here that it is hard to decide where to begin. The main page offers a long list of highlights and new additions, most of them generously illustrated. The site...

Orbital mechanics, propulsion, rocket hardware, space centers and missions are among the topics featured on Robert A. Braeunig's Rocket and space Technology page. Braeunig is a civil engineer whose hobby is learning about space flight. This page is well-researched, and all sources are credited. The text disseminates relatively simple explanations of the mechanics of rocket flight and includes...