Here’s what you’ll learn when you read this story:Research shows the Pacific hemisphere is losing heat faster than the African hemisphere. Scientists from the University of Oslo say one side of Earth’s interior is losing heat much faster than the other side—and the culprit is practically as old as time. Over the extremely long term, this interior will continue to cool until Earth is more like Mars. This contrasts with how Earth loses most of its heat: “Earth’s thermal evolution is largely controlled by the rate of heat loss through the oceanic lithosphere,” the study authors write. To study how Earth’s interior heat behaves, the scientists built a model that divides Earth into African and Pacific hemispheres, then divides Earth’s entire surface into a grid by half degrees latitude and longitude.