A planet is a physical body in space. There are the major ones we use in Astrology–Sun, Moon,Venus, Mars, Saturn, Jupiter, Neptune, Uranus, and Pluto. We use Chiron, as well. I know you know this, but each planet is a unique physical entity with unique mass and gravitational force. Each planet has a unique PULL upon you as each planet has a unique geometrical relationship with you.Each planet exerts it’s particular characteristics UPON you through this gravitational /energetic pull. That is how each planet influences you.