double minimumAltitude      = 0;
            double maximumAltitude      = 0;
            double lowestSafeAltitude   = Util.getMinimumOrbitalAltitude(targetBody);
            double scienceSpaceBorder   = targetBody.Radius + (double) targetBody.scienceValues.spaceAltitudeThreshold;
            double sphereOfInfluence    = (double) targetBody.sphereOfInfluence;
            double maxLowOrbit          = lowestSafeAltitude + (scienceSpaceBorder - lowestSafeAltitude) / 2;
            double maxHighOrbit         = scienceSpaceBorder + (sphereOfInfluence - scienceSpaceBorder) / 2;
            double orbitMoho            = 5263138;
            double orbitEve             = 9832684;
            double orbitKerbin          = 13599840;
            double orbitDuna            = 20726155;
            double orbitEloo            = 113549713200;


            if (targetBody == Planetarium.fetch.Sun) {
                if (difficultyFactor <= 0.2) {
                    // near Kerbin
                    maximumAltitude = orbitDuna;
                    minimumAltitude = orbitEve;
                } else if (difficultyFactor <= 0.4) {
                    // far from sun
                    maximumAltitude = orbitEloo;
                    minimumAltitude = orbitDuna;
                } else {
                    // close to sun
                    maximumAltitude = orbitEve;
                    minimumAltitude = lowestSafeAltitude;
                }
            } else if (targetBody == Planetarium.fetch.Home) {
                if (difficultyFactor <= 0.2) {
                    minimumAltitude = lowestSafeAltitude;
                    maximumAltitude = maxLowOrbit;
                } else if (difficultyFactor <= 0.4) {
                    minimumAltitude = maxLowOrbit;
                    maximumAltitude = maxHighOrbit;
                } else {
                    minimumAltitude = maxHighOrbit;
                    maximumAltitude = sphereOfInfluence * 0.9;
                }
            } else {
                if (difficultyFactor <= 0.2) {
                    maximumAltitude = sphereOfInfluence * 0.9;
                    minimumAltitude = maxHighOrbit;
                } else if (difficultyFactor <= 0.4) {
                    maximumAltitude = maxHighOrbit;
                    minimumAltitude = maxLowOrbit;
                } else {
                    maximumAltitude = maxLowOrbit;
                    minimumAltitude = lowestSafeAltitude;
                }
            }