The Planetary Society is developing and conducting a privately funded solar sail project with Cosmos Studios. The spacecraft will be developed, launched and operated in Russia.

Explains the different propulsion systems that could be used to send humans to Mars.

Aims to develop systems to transport small civilian payloads into a low-earth orbit (LEO).

(part of Marshall Space Flight Center). Gives details on current research projects.

Looks at the many types of launch vehicles and propulsion technologies that are in service or proposed.