pythonarcade
diff --git a/‎asteroids/asteroid_sprite.py
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+from asteroids.constants import *
+import arcade
+
+
+class AsteroidSprite(arcade.Sprite):
+    """ Sprite that represents an asteroid. """
+
+    def __init__(self, image_file_name, scale):
+        super().__init__(image_file_name, scale=scale)
+        self.size = 0
+
+    def update(self):
+        """ Move the asteroid around. """
+        super().update()
+        if self.center_x < LEFT_LIMIT:
+            self.center_x = RIGHT_LIMIT
+        if self.center_x > RIGHT_LIMIT:
+            self.center_x = LEFT_LIMIT
+        if self.center_y > TOP_LIMIT:
+            self.center_y = BOTTOM_LIMIT
+        if self.center_y < BOTTOM_LIMIT:
+            self.center_y = TOP_LIMIT