The printer, Osiander, wrote, as a preface to Copernicus' book On the Revolutions of the Heavenly Spheres, "So far as hypotheses are concerned, let no on expect anything certain from astronomy, which cannot furnish it, lest he accept as the truth ideas conceived for another purpose, and depart from this a greater fool than when he entered it." (188) To the reader, this was meant as a warning. What do you think he meant? In Chapter 10 and 11 Sobel suggests this warning may have kept Copernicus out of "trouble." Do you agree or disagree? Explain.