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After six years of study, Venus Express has found that during that time the super-rotating winds of Venus have actually increased in speed.
When Venus Express arrived at the planet in 2006, average cloud-top wind speeds between latitudes 50º on either side of the equator were clocked at roughly 300 km/h [186 mph]. The results of two separate studies have revealed that these already remarkably rapid winds are becoming even faster, increasing to 400 km/h [250 mph] over the course of the mission.