How can I assign an image texture on a Circle? I was recently working on a project of modelling the "Solar System",every thing was alright,but when it was time for Saturn I couldn't assign the ring texture on the model (Circle - rings of Saturn).

 

I Couldn't Uv-unwrap the Rings correctly.So What is the best way for assigning the texture on the circle (Rings) ?


Here is my Rings texture :



Thank you in advance ! Please In The Answer Explain With Photos.

Wanted ring shape :
In Edit Mode select all your faces making sure you specifically click on one of them to make it the active face.

Unwrap it using the Follow Active Quads option. 
In the UV Image Editor turn on the option Constraint to Image Bounds under the UV menu.

Rotate your unwrapped faces 90º if necessary so their orientation follows the rings.

Move them so they fit to the 0,0 coordinate then using scale resize them so they completely fit within the image boundaries. The Constraint to Image Bounds option should make sure everything snaps into place easily.