> Mars Society International

> ALL ABOUT SPACE PROJECTS from the Astronautic Encyclopedia, the most complete online encyclopedia on space projects

> Explore Mars has been co-founded by Artemis Westenberg, former president of the Mars Society Netherlands. Explore Mars Inc. is a non-profit corporation organized in the Commonwealth of Massachusetts.

> Spaceflight Now designates itself as “The leading source for online space news”

> The Mars Institute is an international non-governmental organization with the goal of advancing the knowledge of Mars and related news