I almost got my degree on astrophysics. Yes, I read a lot of bad and good textbooks. This one is rather brilliant, lucid, and well done. But I have to follow u

I almost got my degree on astrophysics. Yes, I read a lot of bad and good textbooks. This one is rather brilliant, lucid, and well done. But I have to follow up with: "Well, but... how do we really know?" A: We have followed up well worn paths of scientific inquiry, and looked at our assumptions, in designing an experiment that, we assume to fail. When it does not follow our assumption, then we can only rule out failure, and call it a success. This follows centuries of this type of exacting and painstaking scientific work. Although I would normally have 10 ~ 12 citations of very diverse work, that exercise is left to the reader.