Objects in scene still visible with no lighting?

[system]

Does unity have a default camera light?

I created a scene and did not add any light sources however objects in the scene are still visible while playing. Is there any way to make it more realistic and have them render black in extremely dark areas?

[system]

Found it, the render settings ambient lighting was defaulting to an off grey instead of black.

[e-bonneville]

Change the ambient light value to a darker grey from Edit/Render Settings.