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From the Big Bang to Planet X The 50 Most-Asked Questions about the Universe And Their Answers Author: What exactly is the Big Bang Theory? How do we know the universe is expanding? What is a black hole? Does a Planet X exist? What came before the Big Bang? How many galaxies are in the universe? These are just six of the 50 questions answered in this fact-filled guide to the latest findings and theories in astronomy. Concise yet authoritative, i... more »
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