Plait debunks common misconceptions.... Then he takes off the gloves and goes after those he deems responsible for intentionally spreading misinformation saying, "Of all the forms of bad astronomy, pseudoscience is the most pernicious."
He spends a chapter on a best-selling book of a few decades ago, Immanuel Velikovsky's World's in Collision
.... The title of this chapter, "Worlds in Derision," pretty much tips off the attitude of the author.
Other targets include creationists, ufologists, and star-naming outfits. Astrology comes under particularly vicious attack. According to the author, "Astrology doesn't work. It's hooey, hogwash, and balderdash.... Astrologers rely on mumbo-jumbo to bamboozle the public." Gee, tell us how your really feel, Phil!