Glass-reflection with no other objects in scene

I made a simple planet throwing a texture on a highpoly sphere, i want i to be a planet with a completely flat surface, and a glasslike reflection. Now, raytracing itself doesn’t seem to be the solution since there are no other objects in the scene, hence nothing to reflect. Is there a way to make a reflection purely of light?
Something like this would be awesome!

Hope you can help me!