The Hipparcos satellite was a space observatory launched by the European Space Agency in 1989. Its primary mission was to measure the positions, distances, and motions of stars with high precision. By observing over 118,000 stars, Hipparcos provided valuable data that improved our understanding of the structure and dynamics of the Milky Way galaxy. Hipparcos operated until 1993, and its data has been crucial for various fields in astronomy, including stellar classification and the study of exoplanets. The satellite's legacy continues through the Hipparcos catalog, which remains a key resource for astronomers worldwide.