screen EQUALS screen 900 900 screen 10 10 screen #000000 sun EQUALS sun turtle sun slow sun hideturtle sun 3 sun penup sun #ffff00 #ffff00 sun 0 0 sun 100 mercury EQUALS venus EQUALS earth EQUALS mars EQUALS = planets mercury venus earth mars = distances 125 200 300 400 = speeds 40 30 20 10 = colors #c0c0c0 #ffcc33 #33ff33 #ff0000 = i 0 planet planets planet circle planet colors % i 4 colors % i 4 planet penup planet left 90 planet distances % i 4 0 += i 1 planet planets planet showturtle loop_var 300 = j 0 planet planets planet distances % j 4 speeds % j 4 += j 1