Blender Render, can't render a background I am new to blender, and I just finished my first low poly scene. I would like to add a night sky background, but when I click render, the sky disappears. 

Is there a way to render my scene with the background? I have the Sky option checked in the 'Shading' tab as well as in the Render Layer.
Assuming Blender Render
Blender has background which can appear in the render.  With the camera selected and shading panel verify that alpha has sky selected.
Under the layers tab you must have Sky selected as well