Information about the European Space Agency's Gaia mission can be found on several ESA web sites. The web sites have been devised to serve different audiences. More details of these sites are given below.

This web site (http://www.rssd.esa.int/gaia) contains information and resources for individuals working closely with the Gaia project. The site is a tool for information flow between these people, and provides access to material that they require in order to keep up-to-date with developments in the project. Some of the content that was previously to be found on this site (e.g. overviews of the mission, description of scientific goals, etc.) has been moved to the Science and Technology web site (see below).

The Science and Technology web site (Sci-Tech Portal) contains material of interest to the scientific, technical and industrial communities involved in the many missions of ESA's Science Programme. The Gaia pages of the Sci-Tech Portal contain mission overviews, summaries of the scientific goals of the mission, satellite and payload descriptions, and up-to-date status notes from the project. There are also links to outreach material produced by the project.

ESA's Science Programme Communication Service is responsible for communication, for ESA's Science Directorate, to the general public. Communication activities, including those on the Science Outreach web site, are programme-oriented and not mission-oriented, thus Gaia will be presented in the context of the Science Programme as a whole.

There exist many other web sites dealing with the Gaia mission (see Related sites section). These are created and maintained by groups working on different aspects of the mission. ESA is not responsible for the content of these related sites.