![rendered model with a background][1]  
In this image I used a galactic photo from the Hubble Telescope, public domain, and textured it to a plane. I can animate the ship across the image. Use a Generated Texture Coordinate along with an Emission Shader set around 1.0 to your Material Output node. This will eliminate unwanted light reflections. Other scenes can be created using a Diffuse BFDS and ambient light, such as a room. With a Diffuse node you can cast a shadow. I like this better than a background image, because it's easier to manipulate with your camera to animate your scene than as a Background which always remains aligned with your camera view.


  [1]: https://i.sstatic.net/vnSBN.jpg