Zachary Foster Physics TED Talk
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EnglishVoice Age
Middle Aged (35-54)Accents
North American (General) North American (US General American - GenAM)Transcript
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the very early universe right after the Big Bang, but before it had expanded very much, also involved extraordinarily high densities and light that was admitted extremely long ago. It is just now reaching us can help us in determining and investigating current problems in physics. One major source of info is the cosmic microwave background or the CMB in the early universe. Right after that big bang, A great deal matter in a great deal of energy in a very, very small space, and as a result, photons that were emitted from a source just hit particles of matter almost instantly, and they were absorbed as the universe expanded the density of the universe. Decreased or equivalently, the space between particles increased, such that light could travel farther and farther before hitting matter in becoming absorbed. Eventually, at a certain point, light became able to travel almost freely without bumping into matter anymore. In that light, which happened to be in the microwave area of the electromagnetic spectrum. Because of the prevailing temperature of the universe of the time, it's still moving through the universe today. Since this light was everywhere in the universe at the time, it is everywhere today as well. So what forms of background to everything in the cosmos and hence the name cosmic microwave background measurements of the CMB are also evidence of the expanding universe. Since the explanation for the CMB is that the universe was once much smaller than it presently is, it has been expanding ever since. And it is hoped that more and more precise measurements of the CMB will yield answers to questions about how the universe came to be in its present state.