Page 2 - Gravity and the Universe Gravity not only makes us humans and other objects stick to the Earth, it also affects the structure of the universe on a very large scale. The organization of our solar system is based on the force of gravity. Each orbit of each individual planet revolving around the Sun is being held in place by the force of gravity according to the laws of physics. In this section we will explain the attraction of gravity between really massive objects, like planets. We will talk about what an orbit is exactly, and why it is a certain oval shape. This section will help you develop an understanding of how gravity affects the universe.