// In JavaScript, we have: let spaceShuttleName = "Determination"; let shuttleSpeed = 17500; let distancetoMars = 225000000; let distancetoMoon = 384400; let milesperKilometer = 0.621; // The same declarations in TypeScript would be: let spaceShuttleName: string = "Determination"; let shuttleSpeed: number = 17500; let distancetoMars: number = 225000000; let distancetoMoon: number = 384400; let milesperKilometer: number = 0.621;