Here are some scifi images to haunt your dreams (as per usual, I’m not responsible for the content on these web sites, but didn’t immediately notice anything amiss):
http://www.paranormalknowledge.com/articles/tag/science-fiction
http://www.darkfaery-subculture.com/sci-fi/a-look-at-science-fiction-books/
http://www.terpconnect.umd.edu/~ehamm/Elementary%20Genres.html
http://www.armchairgeneral.com/forums/showthread.php?t=63820