public class Planet2 {
    public double radie;
    public double x;
    public double y;
    public double z;

    public static double computeVolume(Planet2 p) {
        return 4* Math.PI*Math.pow(p.radie, 3) / 3;
    }//computeVolume

    public static double computeDistance(Planet2 p1, Planet2 p2) {
        return Math.sqrt(Math.pow(p1.x - p2.x,2) + Math.pow(p1.y - p2.y,2)
                                     + Math.pow(p1.z - p2.z,2));
    }//computeDistance

} //Planet2