Two sweet books that relate to this:
A Short History of Nearly Everything, Bill Bryson
This is great and tackles all of the major scientific discoveries/theories from a very easy-to-read perspective and he's a pretty damn funny guy, adding in funny bits about the different people involved. It covers the big bang and everything that folks should at least know something about. Broken up into short bits on each topic, this is easy to pick up and put down as needed. I'm about 3/4 through this.
The Language of God: A Scientist Presents Evidence for Belief, Francis S Collins
What caught my eye on this one is that Collins was the head of the Human Genome Project that mapped the human genetic code in DNA. It blew my mind that he'd be writing about belief in God. Great book for rational/scientific people looking to reconcile belief in God with a belief in the scientific method.