All images below were retrieved
(Look for the link to the "Multimedia Gallery" @ NASA, and within there: "Other Sites".)
These copies are slightly compressed ("c" added to end of each name). Look for the
same respective names within "...nasa.gov" for (larger and) best quality images.
They are not copyrighted, per se, but please see the usage guidelines at: http://www.nasa.gov/gallery/photo/guideline.html
These images can be downloaded, copied, printed and re-distributed, as
discussed in the "guideline" notice referenced above. Enjoy!
OUR SOLAR SYSTEM
DISTANT STARS & GALAXIES