ساينس الصف الرابع الإبتدئي – الفصل الدراسي الاول In This part we will study : 2. Eight planets Planets: They are eight dark bodies that revolve around the Sun in fixed orbits. Mars is a planet . Because it is a dark body that revolves around the Sun in a fixed orbit. بالتوفيق مستر احمد الباشا