 Gravitation (Physics Series)This is a textbook on gravitation physics (Einstein's "general relativity" or "geometrodynamics"). It supplies two tracks through the subject. The first track is focused on the key physical ideas. It assumes, as mathematical prerequisite, only vector analysis and simple partial-differential equations. It is suitable for a... |  |  The Next Million Years.WHEN anyone starts to write on a subject, at which he has not hitherto worked professionally, his proper procedure should be to set out on a long course of reading, with careful preparatory annotations of all he has read. Such a course on a tremendous subject like the present one might easily take ten years. At the time when I determined to write... |  |  |