Venus's slow rotation is key to its lack of a moon, new research suggests

New research, led by astrophysicist Stephen Kane at the University of California, Riverside, suggests that Venus's unusually sluggish spin is the primary reason it does not possess a moon. Computer simulations indicate that any ancient Venusian moon would have inevitably crashed into the planet, sometimes within as little as 30 million years. The study appears in The Astrophysical Journal.