sentence2_structure: Only the sun in our solar system<>give off<>their own light
sentence1: My lessons will give only a brief overview of objects in our Solar System because &quot;planetology&quot; is a specialty of its own involving not only astronomy but also chemistry, geology and meteorology.
sentence2: Only the sun in our solar system give off their own light.
question: Which objects in our solar system give off their own light?