Cast light from one Object onto another Object I want the sun to glow and cast sunshine at the earth. I have set the surface of the sun to emission and 1000 in strength, but the earth is still in the dark when in rendered mode. Does anyone have a suggestion? 

I am using Blender 2.8 and Cycles.
In Cycles:


Set the desired Emission node value to your Sun-sphere;
Put, a bit in front of the Sun-sphere, the spot lamp lighting the Earth-sphere. The lamp's strength should match the emit value. And align the lamp with both spheres.


Done