Gravitation by Charles W. Misner, John Archibald Wheeler (Contributor), Kip S. Thorne (Contributor)
While professional cosmologists usually prefer Weinberg's work- MWT's "Gravitation" is certainly
more accessible and captivating. It can be read by undergraduates with joy (even laymen can indulge in
at least 30% of the book). Overloaded with illustrations, introducing math apparatus in most cautious manner, full
of historical and anecdotal information- cosmology aficionados will embrace this magnum opus as their Bible.
accessibility - Advanced (Intermediate level textbook equivalent)