This is a set of six web pages, authored and curated by David P. Stern, describing four unconventional methods of accelerating spacecraft. These are using cannons, nuclear power, solar sails and ion rockets....

This site, hosted by the University of Washington's Earth and Space Sciences Program, discusses an advanced plasma propulsion system that will enable spacecraft to attain unprecedented speeds, with minimal energy and...

Authored and curated by David P. Stern, these pages explore orbits and the "Lagrangian points", where objects will orbit the sun with the same period as the earth. This has applications for solar monitoring spacecraft....

Authored and curated by David P. Stern, This page, part of "From Stargazers to Starships," is devoted to the story of Robert H. Goddard and his contributions. Biographical details of Goddard's life and career are...

This is an historical overview of spaceflight, stressing the technology of rockets, satellites and orbits, and its use in unmanned missions. It contains sections on rocket motion, Robert Goddard, history of rocketry and...