
Moon-Sized Impact May Have Forged Venus’s Slow Retrograde Spin
A new presentation argues Venus’s slow retrograde rotation could result from a high-angle, moon-sized impact in its first 50 million years, triggering a magma ocean and melting most of the mantle; depending on the impact specifics, this could evolve into the current rotation while leaving open questions about interior water and Venus’s lack of plate tectonics.












