Space Exploration (Universes Large and Small)by Jackie Ball, Gareth Stevens Publishing, Dan Franck, Paul Barnett
We used to think our planet was the center of the universe. We also used to think our Solar System was the only one in the universe. Many people today think we are the only intelligent life that exists. Are we? In Space Exploration, Discovery Channel takes you out of this world to learn what we know about our universe and how we know it.
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