public static double GetSurfaceGravity(this Planet p) { PlanetAttr attr = GetAttr(p); return(G * attr.Mass / (attr.Radius * attr.Radius)); }
public static double GetSurfaceWeight(this Planet p, double otherMass) { PlanetAttr attr = GetAttr(p); return(otherMass * p.GetSurfaceGravity()); }