Even as a child I was attracted to both space art and astronomical art. Astronomical art represented the unknown and unexplored. Space art represented humankind's quest to expand our understanding of the universe and our presence in it. Following is a list of some space and astronomical art web sites that I have found useful in the past.
The science of Astronomy, embracing, as it does, all the phenomena of the celestial orbs, has furnished in all ages the grandest problems for the exercise of human genius.
From Popular Astronomy by B.O.M. Mitchel, Director of the Cincinnati and Dudley Observatories.