![The Solar System (World Discovery Science Readers)](https://nationalbookswap.com/pbs/m/96/6496/9780439676496.jpg)
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Terry N. reviewed on + 123 more book reviews
Did you know it takes at least 20 billion years for a beam of light to travel from one end of the universe to the other? Did you know that more than 1 million Earths can fit inside our solar system's star, the sun?