This document provides an overview of the key concepts and activities to be covered in a Natural Science unit on the Sun's role as the engine that powers the Earth. The unit will study solar radiation, the atmosphere and its layers/composition, and meteorology. It will examine how the Sun modifies the landscape and how humans are affected by its radiation. Students will conduct a laboratory activity measuring density and solve problems about the external energy of planets. The unit aims to develop approaches to learning skills like time management and working in groups. It also seeks to cultivate characteristics of the IB learner profile such as being inquirers, thinkers, and reflective.