public Simulator(int numberOfPlanets,int width,int height,String forceName) {
		this.numberOfPlanets = numberOfPlanets;
		BOX_WIDTH=width;
		BOX_HEIGHT=height;
		this.forceName=forceName;
		SetSolarSystem();
	 	setPreferredSize(new Dimension(BOX_WIDTH, BOX_HEIGHT));
		addKeyListener(new TAdapter());
        	setFocusable(true);
		timer = new Timer(1000 / UPDATE_RATE, this);
		timer.start();
	}