Chapter 3: Let There Be Light (summary)

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The universe's fastest substance, light, becomes this chapter's main focus. Tyson explains the intricacies of something very common called the electromagnetic spectrum and how various types of different type of light, and it's multitude of different wave length might disclose cosmic mysteries. Every wavelength, from gamma rays to radio waves, offers a different perspective that aids scientists in unlocking the many secret that the universe holds and it meanings behind them. Speaking of waves, a major theory that helps to confirm the big bang is microwave background radiation. This theory states that immediately after the big bang, there was a large amount of radiation dispersed throughout space. Finally the chapter ends by talking about the ground braking technique that helps scientists measure the temperature of space and its astronomical entities. This helped to determine how large stars are and potential how much energy they produce.

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