*The Extravagant Universe: Exploding Stars, Dark Energy, and the
Accelerating Cosmos*, R. P. Kirshner (Princeton University Press,
Princeton, 2002).

A good online source of cosmological information is:

*Ned Wright's Cosmology Tutorial*,
http://www.astro.ucla.edu/~wright/cosmolog.htm

The following cosmology textbooks are arranged in increasing order of technical difficulty:

*Cosmology: The Science of the Universe*, 2nd ed., E. Harrison
(Cambridge University Press, Cambridge, 2000).

*Cosmology: a First Course*, M. Lachièze-Rey (Cambridge
University Press, Cambridge, 1995).

*Principles of Physical Cosmology*, P. J. E. Peebles (Princeton
University Press, Princeton, 1993).

*The Early Universe*, E. W. Kolb and M. S. Turner (Addison-Wesley,
New York, 1990).

*The Large-Scale Structure of Spacetime*,
S. W. Hawking and G. F. R. Ellis (Cambridge University Press,
Cambridge, 1975).