We've learned that Venus space exploration started in 1962 with the Mariner 2 space craft that flew by the planet, and then after that the exploration continued closer into the planet's atmosphere with the Venera 3-6 and Mariner 5 space crafts.
The exploration continued on, as scientists tried to land space crafts on the surface, or get the space craft close enough to take pictures of the surface from outer space.
For 13 years, the Russian space program sent 10 different space crafts to study Venus.
Venera 7 - 14 all were landers that studied the surface after landing on the planet, and 15 - 16 studied the planet from space.
For 5 years the US NASA space program sent 3 space crafts to study Venus. Mariner 10 and did a fly by on its way to Mercury. Pioneer Venus Orbiter orbited around the planet to study from space. Pioneer Venus Multiprobe studied the atmosphere and also had some probes land on the surface to study it.
(from: wikipedia - pioneer venus multiprobe)
Kid Facts - Blast from the past: Hertzsprung-Russell Diagram
