Here is a selection of recommended links, for those who like making or viewing astronomical art.
International Association of Astronomical Artists
IAAA – The International Association of Astronomical Artists. The body for all who are serious about their astronomical art! I am proud to be on the board of this association.
Saturn Imagery
CICLOPS, the Cassini Images page, a vast number of awesome images of Saturn.
Pluto Imagery
LORRI image release of Pluto images.
NASA 3d object library
NASA 3d object library.
A great place to get free meshes. Quality varies a lot, but the best are very good indeed!
Foundation 3d Graphics Forum
Foundation 3D is my favourite 3D forum, I release some of my meshes there.
Free Astronomical Art Forum
International Space Art Network. a great place for amateurs and professionals to share great space art. No membership fee!