Earth Tipped on Its Side 84 Million Years Ago, New Evidence Suggests

Diagram showing solid-body rotation of the Earth with respect to a stationary spin axis due to true polar wander. [Credit: Wikipedia]The researchers say their finding ‘challenges the notion that the spin axis has been largely stable over the past 100 million years.’ – – – We know that true polar wander (TPW) can occasionally tilt […]

Earth Tipped on Its Side 84 Million Years Ago, New Evidence Suggests