History of the Universe: What happened in the first 370,000 years скачать в хорошем качестве

History of the Universe: What happened in the first 370,000 years

For anyone who hasn't watched part 1, the link is here    • History of the Universe: What happened in ...   I’ve looked at what happened during the universes first second, and blimey it was busy. Now I want to have a look at another slice of the history of our universe, so in this video I’m going to look at what happened from 1 second to about 370,000 years. Let’s find out more. 370,000 years isn’t just some random number that I’ve picked out of the air. There is a very important reason for selecting that time, but we'll get to that later. Firstly we’ll start at time equals 1 second, and we’ve just left the hadron epoch. The very end of the hadron epoch saw an important event occurring. That is the decoupling of neutrinos. Before this time neutrinos interacted with the matter that existed in the universe, but at a time of 1s, neutrinos stopped interacting with matter. Since the neutrinos at this time no longer interacted with matter, they just started flying round the universe, and have been flying round the universe ever since. Somewhere out there, these neutrinos still exist and form what is called the neutrino background radiation, but these neutrinos are very low energy. Much lower in energy than neutrinos made today in the heart of suns. These neutrinos are out there but due to their low energy we may never discover them. Microwave Background Radiation Image Credit: NASA / WMAP Science Team Chapters 0:00 Introduction 0:30 Neutrino Decoupling 1:25 Lepton Epoch 2:15 Matter is Energy 3:45 Photon Epoch 5:20 Nucleosynthesis 6:10 Proton-Proton Chain Reaction 7:30 Energy Density 8:20 Atoms Form 8:45 The Universe Becomes Transparent