After the Mariner 2 space craft got close to the planet Venus, scientists kept trying to get closer.
Starting in 1967, the Russians sent some spacecrafts to study the air around Venus (called the atmosphere).
The Venera 3 was first but it crashed on the planet and never sent back any information.
They sent 3 more spacecrafts, the Venera 4, Venera 5 and Venera 6.
The USA also sent the spacecraft Mariner 5 to Venus to study the sky.
(from: wikipedia - Mariner 5)
Kid Facts - Blast from the past: Luminosity Class
