A Brief History of the Universe: Crash Course Astronomy #44

Thanks to the wonders of physics, astronomers can map a timeline of the universe’s history. Today, Phil’s going to give you an overview of those first few minutes (yes, MINUTES) of the universe’s life. It started with a Big Bang, when the Universe was incredibly dense and hot. It expanded and cooled, going through multiple stages where different kinds of matter could form. It underwent a phenomenally rapid expansion called inflation, which smoothed out much of the lumpiness in the matter. Normal matter formed atoms between 3 and 20 minutes after the bang, and the lumps left over from inflation formed the galaxies and larger structures we see today. Crash Course Astronomy Poster: -- Table of Contents Mapping the History of the Universe Using Math and Observations 00:41 It Started With A Bang! 1:58 Rapid Expansion Smoothed Out Matter 4:55 Normal Matter Formed After 3-20 Minutes 5:12 -- PBS Digital Studios: Fo