Blender objects emit light

Objects being import through blend files are emitting light during my night cycle. The grass and rocks are also from blender but the don’t emit light.

This occurred before and after adding a light source next to the tree. Everything is pitch black except the only lonely tree.

Its not that its emitting light, its that its not recieving a shadow, notice how its not lighting up the ground next to it. try giving it a material.