The Cosmic Microwave Background
http://relativity.livingreviews.org/Articles/lrr-1998-11/index.htmlReview article by A. W. Jones and A. N. Lasenby (Cambridge University) about the electromagnetic remnants of the big bang phase. Requires undergraduate-level physics knowledge. Published in the electronic review journal, Living Reviews in Relativity.
Submitted in section: Astronomy: Cosmology: Cosmic Background Radiation: The Cosmic Microwave Background