Due to it's slow rotation it actually completes a full rotation of the sun before it itself fully rotates.

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[–] 5 points 11 months ago

According to Wikipedia, it seems that the current scientific explanation is that the runaway greenhouse effect was caused by the evaporation of oceans (caused by the brightening of the sun). The presence of vapor in the atmosphere led to the runaway greenhouse effect.

https://en.wikipedia.org/wiki/Runaway_greenhouse_effect?useskin=monobook#Venus

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