===================================================================
--- original.js
+++ change.js
@@ -68,8 +68,22 @@
 			heroBullets.splice(heroBullets.indexOf(self), 1);
 		}
 	};
 });
+var StarBackground = Container.expand(function () {
+	var self = Container.call(this);
+	var background = self.attachAsset('starBackground', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 2;
+	self.update = function () {
+		self.y += self.speed;
+		if (self.y > 2732) {
+			self.y = 0;
+		}
+	};
+});
 
 /**** 
 * Initialize Game
 ****/ 
@@ -79,8 +93,13 @@
 
 /**** 
 * Game Code
 ****/ 
+// Initialize star background
+var starBackground = new StarBackground();
+starBackground.x = 2048 / 2;
+starBackground.y = 0;
+game.addChild(starBackground);
 // Initialize arrays and variables
 var hero;
 var heroBullets = [];
 var enemies = [];
@@ -106,8 +125,10 @@
 	hero.x = x;
 	hero.y = y;
 };
 game.update = function () {
+	// Update star background
+	starBackground.update();
 	// Update hero bullets
 	for (var i = heroBullets.length - 1; i >= 0; i--) {
 		heroBullets[i].update();
 	}