Nasa image gallery : Archivos digitales de la Nasa. Digital archives Nasa

Uno de los lugares, relativamente poco conocidos, para descargar imágenes, de gran belleza es el archivo digital, NASA IMAGE GALLERY.

This view looks toward the unilluminated side of the rings from about 44 degrees below the ring plane. Images taken using red, green and blue spectral filters were combined to create this natural color view.  The images were taken with the Cassini spacecraft wide-angle camera on July 29, 2013.
This view was acquired at a distance of approximately 1.003 million miles (1.615 million kilometers) from Saturn. Image scale is 58 miles (93 kilometers) per pixel.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency

Still Images, Audio Recordings, Video, and Related Computer Files
NASA still images; audio files; video; and computer files used in the rendition of 3-dimensional models, such as texture maps and polygon data in any format, generally are not copyrighted. You may use NASA imagery, video, audio, and data files used for the rendition of 3-dimensional models for educational or informational purposes, including photo collections, textbooks, public exhibits, computer graphical simulations and Internet Web pages. This general permission extends to personal Web pages.