book explaining principles of cosmology

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Hi I have interest in science and space especially, but i didn't at school and didn't pay any attention in science class so ive got very little knowledge of the subject. I know some of the basic theories of cosmology but have no grounding in them - would anyone be so kind as to recommend me a book which will explain the basic principles behind the subject - Preferably one that wont just reel off facts as i already have a fair few of these but no substance behind them. I am willing to try to digest some equations if required Thanks for reading