Create a new function called createStars() and lay out the star objects in a for loop. Add in the "collision" event that will be called by onStarCollision() to remove the stars when they are hit by the panda. Rotate the stars forward and backward at 10 seconds and 1,080 and -1,080 degrees each. This will allow the stars to rotate three full intervals backward and forward. Create the walls for the left and right sides of the screen:

local createStars = function()

  local numOfRows = 4
  local numOfColumns = 12
  local starPlacement = {x = (display.contentWidth  * 0.5) - (starWidth * numOfColumns ) / 2  + 10, y = 50}

  for row = 0, numOfRows - 1 do
    for column = 0, numOfColumns - 1 do

      -- Create a star
    ...