diff --git a/source-code-startdust/stardust.py b/source-code-startdust/stardust.py
index 6ab24f1..63f4d3a 100644
--- a/source-code-startdust/stardust.py
+++ b/source-code-startdust/stardust.py
@@ -6,99 +6,111 @@
 count = gameover = 0
 asteroids = []
 bullets = []
-for a in range(0, 4):
-    asteroids.append(Actor('ast1_'+str((a+1)*3), center=(100+(a*200),100+((a%2)*400))))
-    asteroids[a].angle = (80*a) + 20
+for a in range(4):
+    asteroids.append(Actor('ast1_' + str((a + 1) * 3), center=(100 + (a * 200), 100 + ((a % 2) * 400))))
+    asteroids[a].angle = (80 * a) + 20
     asteroids[a].status = 0
 
+
 def draw():
     screen.blit("background", (0, 0))
-    for b in range(0, len(bullets)):
-        bullets[b].draw()
+    for bullet in bullets:
+        bullet.draw()
     drawAsteroids()
-    if gameover != 1 or (gameover == 1 and count%2 == 0): ship.draw()
-    if gameover == 1 : screen.draw.text("YOU CLEARED ALL THE ASTEROIDS", center = (400, 300), owidth=0.5, ocolor=(255,255,0), color=(255,0,0) , fontsize=50)
-    
+    if gameover != 1 or (gameover == 1 and count % 2 == 0): ship.draw()
+    if gameover == 1: screen.draw.text("YOU CLEARED ALL THE ASTEROIDS", center=(400, 300), owidth=0.5,
+                                       ocolor=(255, 255, 0), color=(255, 0, 0), fontsize=50)
+
+
 def update():
     global count
     count += 1
     if gameover == 0:
-        if keyboard.left : ship.angle += 2
-        if keyboard.right : ship.angle -= 2
+        if keyboard.left: ship.angle += 2
+        if keyboard.right: ship.angle -= 2
         updateBullets()
         updateAsteroids()
 
+
 def on_key_down(key):
     if gameover == 0:
         if key.name == "SPACE": makeBullet()
 
+
 def drawAsteroids():
-    for a in range(0, len(asteroids)):
-        if asteroids[a].status == 0: asteroids[a].draw()
+    for asteroid in asteroids:
+        if asteroid.status == 0: asteroid.draw()
+
 
 def updateAsteroids():
     global gameover
     asteroidsLeft = False
-    for a in range(0, len(asteroids)):
-        if asteroids[a].status == 0 : asteroidsLeft = True
-        i = int(asteroids[a].image[5:])
-        if count%5 == 0: i += 1
+    for asteroid in asteroids:
+        if asteroid.status == 0: asteroidsLeft = True
+        i = int(asteroid.image[5:])
+        if count % 5 == 0: i += 1
         if i > 12: i = 1
-        imagebase = asteroids[a].image[0:5]
-        angle = asteroids[a].angle
-        asteroids[a].x += math.sin(math.radians(angle))
-        asteroids[a].y += math.cos(math.radians(angle))
-        if asteroids[a].x > 850 : asteroids[a].x -= 850
-        if asteroids[a].x < -50 : asteroids[a].x += 850
-        if asteroids[a].y > 650 : asteroids[a].y -= 650
-        if asteroids[a].y < -50 : asteroids[a].y += 650
-        asteroids[a].image = imagebase + str(i)
-        asteroids[a].angle = angle
-    if asteroidsLeft == False : gameover = 1
+        imagebase = asteroid.image[0:5]
+        angle = asteroid.angle
+        asteroid.x += math.sin(math.radians(angle))
+        asteroid.y += math.cos(math.radians(angle))
+        if asteroid.x > 850: asteroid.x -= 850
+        if asteroid.x < -50: asteroid.x += 850
+        if asteroid.y > 650: asteroid.y -= 650
+        if asteroid.y < -50: asteroid.y += 650
+        asteroid.image = imagebase + str(i)
+        asteroid.angle = angle
+    if not asteroidsLeft: gameover = 1
+
 
 def updateBullets():
     global bullets
     bulletsTemp = []
     tb = 0
-    for b in range(0, len(bullets)):
-        if isOnScreen(bullets[b]) and not hitAsteroid(bullets[b]) :
+    for bullet in bullets:
+        if isOnScreen(bullet) and not hitAsteroid(bullet):
             bulletsTemp.append(Actor('bullet'))
-            bulletsTemp[tb].x = bullets[b].x + 5 * math.sin(math.radians(bullets[b].angle))
-            bulletsTemp[tb].y = bullets[b].y + 5 * math.cos(math.radians(bullets[b].angle))
-            bulletsTemp[tb].angle = bullets[b].angle
+            bulletsTemp[tb].x = bullet.x + 5 * math.sin(math.radians(bullet.angle))
+            bulletsTemp[tb].y = bullet.y + 5 * math.cos(math.radians(bullet.angle))
+            bulletsTemp[tb].angle = bullet.angle
             tb += 1
     bullets = bulletsTemp
-    
+
+
 def hitAsteroid(b):
-    for a in range(0, len(asteroids)):
-        if asteroids[a].collidepoint(b.pos) and asteroids[a].status == 0:
-            breakAsteroid(a,b.angle)
+    for index, asteroid in enumerate(asteroids):
+        if asteroid.collidepoint(b.pos) and asteroid.status == 0:
+            breakAsteroid(index, b.angle)
             return True
     return False
 
-def breakAsteroid(a,angle):
+
+def breakAsteroid(a, angle):
     acount = len(asteroids)
     anum = int(asteroids[a].image[3])
     if anum < 3:
         anum += 1
-        asteroids.append(Actor('ast'+str(anum)+'_1', center=(asteroids[a].pos)))
+        asteroids.append(Actor('ast' + str(anum) + '_1', center=(asteroids[a].pos)))
         asteroids[acount].angle = (angle + 90) % 360
         asteroids[acount].status = 0
         acount += 1
-        asteroids.append(Actor('ast'+str(anum)+'_6', center=(asteroids[a].pos)))
+        asteroids.append(Actor('ast' + str(anum) + '_6', center=(asteroids[a].pos)))
         asteroids[acount].angle = (angle - 90) % 360
         asteroids[acount].status = 0
     asteroids[a].status = 1
 
+
 def makeBullet():
     a = len(bullets)
-    bullets.append(Actor('bullet', center=(400,300)))
+    bullets.append(Actor('bullet', center=(400, 300)))
     bullets[a].angle = (ship.angle + 180) % 360
-    
+
+
 def isOnScreen(b):
-    if b.x > 0 and b.x < 800 and b.y >0 and b.y < 600 :
+    if b.x > 0 and b.x < 800 and b.y > 0 and b.y < 600:
         return True
-    else :
+    else:
         return False
-        
+
+
 pgzrun.go()