Astronomy 1021 Lecture Notes - Lecture 17: Observable Universe, Cosmic Microwave Background, Positron

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Notes: chapter 17 the birth of the universe. The big bang theory describes what the universe was like early in ime. It is based on applying known and tested laws of physics to the idea that everything we see today began as an incredibly hot and dense collecion of mater and radiaion. When two photons collide with a total energy greater than twice the mass-energy of an electron, they can create two brand-new paricles: a negaively charged electron and its posiively charged twin, the anielectron. The electron is a paricle of mater and the ani electron is a paricle of animater. The process can also reverse, when an electron and an anielectron meet, they can annihilate eachother, transforming their mass-energy back into photon energy. The very early universe was so hot that energy could be transformed into mater and vice versa. Universe has four disinct forces: gravity, electromagneism, the strong force, and the weak force.

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