private static void TestPlanets(PlanetBusiness planetBusiness)
        {
            // Basic driver class to test our planet business class and display output.
            Console.WriteLine();
            Console.WriteLine("Planets:");
            Console.WriteLine();

            List<Planet> planetList = planetBusiness.GetPlanets();
            foreach (Planet planet in planetList)
            {
                Console.WriteLine(planet.PlanetId + ". " + planet.Name);
            }

            Console.WriteLine();
            Console.WriteLine("Terraformable Planets:");
            Console.WriteLine();

            planetList = planetBusiness.GetTerraformPlanets();
            foreach (Planet planet in planetList)
            {
                Console.WriteLine(planet.PlanetId + ". " + planet.Name);
            }
        }