You can...

Just dial in some Ambient_Value in the mat room for the ball. Put in some 
lightly yellowish or light orange color in the Ambient_Color.

 
You can....
Add a moonlike texture to the ball in the Ambient_Color, and adapt the Ambient_Value in the mat room.
Remember, if the moon is not visible in the render , a texture is not needed.

You can...
Just put a infinite light, where the moon should be.. (again, if the moon is not visible in the render. Just turn the light down... a lightly yellowish or light orange color would do.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!