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Visitors can look in a missions guide to find lists of missions with their year and organization.
For example, the NASA and NOAA sponsored Geostationary Operational Environmental Satellite is indexed under the year 2002. When visitors select the title of this mission, they see a page that explains that the mission's objective is to improve weather forecasting with better imagery and sounding information. A paragraph describes the mission details and a link takes visitors to the mission's own web site. One of the highlighted technologies collects tiny particle from space. A timeline on the site chronologically organizes spacecraft propulsion from 2350 B.C. to 1998.