Peter James, Ph.D. (IMAGE) Baylor University Caption Baylor University planetary physicist Peter James, Ph.D., provided calculations of the various mechanisms that could be responsible for the force driving the geologic activity on Venus Credit Robert Rogers, Baylor University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.