First spacecraft to map Venus in its entirety

On 13/09/1992, NASA’s Magellan spacecraft completed its third radar mapping cycle of Venus, reaching a major operational milestone by covering approximately 98% of the planet’s surface. This achievement marked the first time a spacecraft had mapped nearly the entire surface of Venus at high resolution, overcoming the challenge posed by the planet’s dense cloud cover. Launched on 04/05/1989 aboard Space Shuttle Atlantis, Magellan entered orbit around Venus on 10/08/1990. Equipped with a synthetic aperture radar (SAR) system, the spacecraft was able to penetrate Venus’s thick atmosphere and produce detailed images of its surface. Over the course of three mapping cycles, Magellan systematically scanned the planet, building a comprehensive dataset of its topography and geological features. By the completion of the third cycle, Magellan had revealed a surface dominated by volcanic plains, extensive lava flows, and large shield volcanoes. The data also identified impact craters, tectonic structures, and features such as coronae and rift zones, providing evidence of widespread volcanic and tectonic activity. The mission’s high-resolution maps significantly improved scientific understanding of Venus’s geological history and internal processes. Following the mapping phase, Magellan continued with additional scientific operations, including gravity measurements and atmospheric studies, before the mission concluded in October 1994 with a controlled descent into Venus’s atmosphere. The data collected during the mapping cycles remains a primary reference for Venus research. Why This Moment Matters: The near-global radar mapping provided the first detailed view of Venus’s surface, establishing a foundational dataset that continues to support planetary science and comparative studies of Earth-like planets.