UNITY SCENE became dark. how to make it look normal?

[Sohib-Voo_Doo]

I am learning Unity5 from youtube tutorial “Unity Tutorial For Beginners - How To Make A Game - Part 004 - TERRAIN & EFFECTS - YouTube”. my scene is blackish and as I turn to another perspective its colors appears right. I tried to reload Unity many times, but no change.

[72338-black-scene.pdf|72338]

[mikelortega]

You should turn on lighting in the editor.