Kurt Vonnegut writes about this sort of art in "God Bless You Mr. Rosewater, and maybe you've seen some of it yourself? My only sample of such is my paperback edition of "Venus on the Half Shell" by Kilgore Trout ( a name anyone familiar with Vonnegut will remember).
Now There is a site that collects that cover art from the old pulp science fiction books and it's called Babes in Space
Yes, now you can travel back to the golden days of science fiction, and view such wonders as