your code
shuttle(50,50)
mothership(500, 500)
wall(300,0,300,300,)
planet(250, 50,"jupiter")
planet(350, 50,"jupiter")
wall(0,350,300,350)
fuel(100,400,1500)
wall(400,200,400,400)
alien(350,100,500,100)
fuel(500,50,500)
planet(50,500,"earth")
wall(450,450,450,600)
asteroid(500,450)
fuel(50,100,500)
asteroid(350,450)