Venus Express is a follow on from the Mars Express mission. Many of the instruments on the mission are simply upgraded versions of those on the Mars Express platform. After a 153 day cruise to Venus the spacecraft entered Venusian orbit on 11 April 2006.
Venus Express's science objectives are to study the atmosphere, the plasma environment, and the surface of Venus in great detail.
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Kevin Baines Planetary And Exoplanetary Atmospheres