In the early 1950's, people started to use technology such as radio telescopes. Most of the voyages to Venus were landed by NASA, and the Soviet Union. The first successful interplanetary spacecraft flew past Venus and made discoveries about its temperature and atmosphere. Later Mariner 2 discovered that the atmosphere was made up of mainly carbon dioxide. Many others have landed since to give us the information we have today.
People continue to be curious about Venus because it is so close to our planet Earth.
As they leave for home, this image of Venus slowly fades from view.