Volcanic activity on the Moon? (IMAGE) University of California - Santa Cruz Caption Artist's impression of what the Moon looked like during the tidal-heating event. There would have been intense volcanic activity everywhere. The early Earth would have loomed much larger in the sky because it was closer. Credit Credit: Alexey Chizhik/Max Planck Institute for Solar System Research Usage Restrictions Please use the provided credit information. License Original 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.