// 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;