The Solar System

This title will cover one of the most important interactions in all of physics - the force due to gravity. You will learn about the factors that govern the strength of gravitational forces, the masses of objects and the distances between them, and why gravitational forces are important. We will explore the planets, the differences and similarities between them, and consider the controversy over what constitutes a planet and what doesn't. The title also explains what causes planets to orbit, and what causes moons and other satellites to orbit planets. You will learn about the Earth, its internal structure and the composition of the atmosphere. We will also discuss how humans are affecting its atmosphere. Finally, the title will consider Earth's seasons, detailing what causes them and how they affect life on Earth.