The Missions and Projects Facet lists NASA missions and projects (as in launched experiements, not missions as in organizational directorates). It has been derived from multiple sources of information. The principal sources were the 1.0 version of the NASA Missions and Projects vocabulary, and the websites of the various missions and NASA centers. This facet is largely an authority list of mission and project names and acronyms. A small amount of categorization of the missions and projects ahs been performed, based on the location of the mission/project, or the location of the object of its study. For example, the Hubble Space Telescope is in Earth orbit, but its purpose is to study deep space phenomena. Therefore it is categorized as a Deep Space and Science Mission. Missions are also categorized by whether the mission had a crew or not. Large families of missions, such as the Shuttle, Apollo, and Explorer missions also have been made into categories. The categorization of past, current, future, and potential missions which was in the 1.0 version of the facet has been removed due to the frequency of changes as missions are in planning stages.