Mariner 6 and 7 comprised a dual-spacecraft mission to Mars, the sixth and seventh missions in the Mariner series of spacecraft used for planetary exploration in the flyby mode. The primary objectives of the missions were to study the surface and atmosphere of Mars during close flybys to establish the basis for future investigations, particularly those relevant to the search for extraterrestrial life, and to demonstrate and develop technologies required for future Mars missions and other long-duration missions far from the Sun.
Mars flybyTACSAT 1 (also TACOMSAT, Tactical Communications satellite) was the largest and most powerful communications satellite at the time when it was launched into synchronous orbit by a Titan-3C booster 9 February 1969, from Cape Canaveral, Florida. The experimental tactical communications satellite was designed and built by Hughes Aircraft Company, under the direction of the U.S. Air Force Space and Missile Systems Organization, for the Department of Defense.
Geosynchronous Orbit