Planet.js

class Planet {
  //The 'build' method
  constructor(position, mass, radius, color) {
    this.position = position;
    //A p5 Vector 
    this.velocity = createVector(0, 0);
    this.mass = mass;
    this.radius = radius;
    this.color = color;
  }
  
  show() {
    //pushing and popping is like save and restore
    push();
    //that way we can translate over to here
    translate(this.position.x, this.position.y);
    fill(this.color);
    //draw our planet
    ellipse(0, 0, this.radius, this.radius);
    //and pop back to wherever we were before
    pop();
  }
}