The terrain is from the Crater Construction Kit (author unknown) with a adjusted material from "Fifty Funky Shapes & Fifty Funky Metals" (available at Daz 3D). The sky is by the "eso_Sky" HDRI (from a complete deep sky panorama (Credits ESO/S. Brunier) an HDRI was faked). Light and colours by reflection, transparency and haze; no sun. A fantastic world in space.