cosmic microwave background radiation definition

cosmic microwave background radiation definition
October 28, 2020

After reading this lesson, you should be able to: To unlock this lesson you must be a Study.com Member. Anyone can earn A black body is an object that is a perfect absorber and emitter of radiation. first two years of college and save thousands off your degree. As the theory … just create an account. Get instant definitions for any word that hits you anywhere on the web! The Cosmic Microwave Background (or “CMB” for short) is radiation from around 400,000 years after the start of the Universe. cosmic microwave background radiation definitions, https://www.definitions.net/definition/cosmic+microwave+background+radiation. If that was the case, then at the time of the Big Bang, a signature of black body radiation would have been produced, just like it is in the Sun. credit by exam that is accepted by over 1,500 colleges and universities. courses that prepare you to earn

© copyright 2003-2020 Study.com. How to say cosmic microwave background radiation in sign language? All rights reserved. 's' : ''}}. But if the Big Bang Theory is correct, then the entire universe was once squashed together, just like the matter in the Sun. If this is true, then in billions of years' time the universe could be a dark and depressing place indeed. credit-by-exam regardless of age or education level. Only after getting in contact with the group of scientists at Princeton did they realize what their discovery meant. Study.com has thousands of articles about every They assumed that it was a problem in their detector, and tried cooling it down, but nothing they did helped. Did you know… We have over 200 college But more than that, the temperature of the black body curve was around 4 kelvin: exactly the temperature that was predicted by the Big Bang Theory. Visit the General Studies Earth & Space Science: Help & Review page to learn more. If the universe is expanding in every direction, it follows that everything we see in the universe today was once compressed to a single point. Get the unbiased info you need to find the right school. Create your account, Already registered? A black body would always produce radiation in a characteristic black body curve, a curve that would only vary if the temperature of the object changed. Services. imaginable degree, area of This lesson defines cosmic microwave background radiation, including the history behind its discovery and what this tells us about the universe as a whole. Scientists tell us that the universe began in a Big Bang, but it wasn't until the discovery of the cosmic microwave background that we knew this for sure. Not sure what college you want to attend yet? Such an object would absorb all radiation that hit it and re-radiate that energy in the same way no matter the source of the original radiation. If the universe had a beginning, how did it start? When one of the scientists at Princeton, Robert Dicke, heard about the discovery, he responded by saying, ''Boys, we've been scooped.''. | {{course.flashcardSetCount}} One of the biggest predictions of the Big Bang Theory was that there would be background radiation left over and detectable today. There was very little evidence at the time that the universe truly was expanding, but the work done by Friedmann did eventually lead to some predictions that we could test. Expecting to hear nothing, they instead found a small amount of background noise - like the 'snow' on an old-fashioned television, or the hum of a radio that isn't tuned to a station. In 1965, Penzias and Wilson detected something they didn't expect. Select a subject to preview related courses: The Big Bang's black body curve has had a lot of time to cool down.

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