STS-30 Atlantis launched from Kennedy Space Center, Florida, on May 4, 1989. During the four-day mission, the crew successfully deployed the Magellan Venus-exploration spacecraft, the first U.S. planetary science mission launched since 1978, and the first planetary probe to be deployed from the Shuttle. Magellan arrived at Venus in mid-1990, and mapped over 95% of the surface of Venus. Magellan has been one of NASA's most successful scientific missions and continues to operate today gaining information about the Venetian atmosphere and magnetic field. In addition, crew members also worked on secondary payloads involving fluid research in general, chemistry, and electrical storm studies. Following 64 orbits of the Earth, the STS-30 mission concluded with a landing at Edwards Air Force Base, California, on May 8, 1989. Mission duration was 96 hours, 57 minutes, 35 seconds.