Venus' Strange Rotation Was Likely Triggered By a High Velocity Moon-Sized Impactor (opens in new tab)

New simulations suggest Venus' extremely slow backward rotation may have been triggered by a high-angle collision with a fast-moving object roughly one-tenth its mass. The impact could have dramatically altered Venus' spin and melted nearly its entire mantle. Universe Today reports: Venus' bizarre and extraordinarily slow retrograde rotation on its axis has long puzzled planetary scientists. But in a new paper presented at the recent European Geosciences Union General Assembly in Vienna, the ...