books.google.co.uk - Our universe was born billions of years ago in a hot, violent explosion of elementary particles and radiationæthe big bang. What do we know about this ultimate moment of creation, and how do we know it?Drawing upon the latest theories and technology, the new edition of The Big Bang, is a sweeping, lucid...http://books.google.co.uk/books/about/The_Big_Bang.html?id=XLwe1lUmz5kC&q=hydrogen&utm_source=gb-gplus-shareThe Big Bang
