flatness problem
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problem in cosmology, solved by cosmic inflation
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Friedmann equations
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shape of the universe
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gravity
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inflation
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expansion of the universe
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Albert Einstein
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atom
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Stephen Hawking
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Big Bang
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International Standard Book Number
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matter
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speed of light in vacuum
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plasma
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wisdom
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general relativity
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electromagnetic radiation
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photon
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cosmology
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sphere
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scientific method
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