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⎧⎪⎪⎨⎪⎪⎩ History of the Universe Age of the Universe Radius of the Visible Universe Inflation Generates Two Types of Waves Free Electrons Scatter Light Earliest Time Visible with Light Density Waves Gravitational Waves Inflation Protons Formed Nuclear Fusion Begins Nuclear Fusion Ends Cosmic Microwave Background Neutral Hydrogen Forms Modern Universe Big Bang Waves Imprint Characteristic Polarization Signals 0 10−32s 1 µs 0.01 s 3 min 380,000 yrs 13.8 Billion yrs Quantum Fluctuations