Cmbr Essay

1176 words - 5 pages

My topic is on Cosmic Microwave Background Radiation (CMBR). It is a really low glow of light that fills the Universe. It could only be detected by using a radio telescope. When you look up at the night sky all you could see is the stars and the darkness behind it so when you use a radio telescope you could see some kind of glow in the sky instead of blackness. It is an afterglow made by the Big Bang and it left the CMBR behind as evidence. Long ago before the stars and planets were formed, the Universe was smaller, hot, and had a glow inside of it. The Cosmic Microwave Background Radiation was created in the Recombination Era when the radiation cooled down and when the Universe started expanding.
CMBR has all kinds of names like: 3 Degree Kelvin Background Radiation, Cosmic Background Radiation, and Microwave Background. It has names likes these because the radiation is like a black body and its’ temperature is less than three degrees Kelvin like about 2.76K. It is cool enough for electrons and protons to recombine into hydrogen atoms. Right now the temperature is about 2.725°. “… If we could see microwaves, the entire sky would grow with a brightness…” (http://map.gsfc.nasa.gov/universe/bb_test_cmb.html). “The reason why we can still see Cosmic Microwave Background Radiation is because; the cosmic microwave background does not originate with the big bang itself. It originates roughly 380,000 years after the big bang, when the temperature dropped far enough to allow electrons and protons to form atoms. When it was released, the cosmic microwave background wasn’t microwave at all-the photons had higher energies. Since that time, they have been red shifted due to the expansion of the universe, and are presently in the microwave band. The universe is opaque from 380,000 years and earlier. The galaxies that we can see only formed after that time. Before that, all that is observable is the CMB.” (http://physics.stackexchange.com.com/questions/25070/why-can-we-see-the-cosmic-microwave-background-cmb).
Comic Microwave background Radiation was first discovered in 1963 by Arno Penzias and Robert Wilson. They were trying to study a sound a faint microwave signals in the Milky Way Galaxy when they heard a strange sound. They thought it was just some pigeon droppings on the antenna equipment, and then they realized it wasn’t the pigeons making the noise but it was the Cosmic Microwave Background Radiation. Since there could be no other explanation for what was making the noise. They were trying to prove that the big bang really happened so they had to find some sort of radiation in space so that’s when they decided to go on a roof a building and find some radiation. In 1978 they were rewarded a Noble Prize for discovering cosmic microwave background radiation.
Cosmic microwave background radiation was considered to be smooth and since nobody could really picture what it actually looks like. The temperature of the CMB today is what causes us to see the...

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