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The Formation of Light Elements in the Big Bang Theory

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Rimbee Dagami

on 21 November 2016

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Transcript of The Formation of Light Elements in the Big Bang Theory

In this lesson, you should be able to give evidence for and explain the formation of the light elements in the big bang theory.
What is Big Bang?
The big bang theory is a cosmological model stating that the universe started its expansion about 13.8 billion years ago.
Pieces of Evidence
Doppler shift or Doppler effect
It explains that when an object gets closer to us, its light waves are compressed into shorter wavelengths. On the other hand, when an object moves away from us, its light waves are stretched into longer wavelengths.
The Formation of Light Elements in the Big Bang Theory
In the 1910s, Vesto Slipher and Carl Wilhelm Wirtz measured the wavelengths of light from spiral nebulae, which are interstellar clouds of dust and ionized gases.
Slipher and Wirtz then explained that the redshift or increase in wavelength was due to the increase in the distance between the Earth and the nebulae. They concluded that the redshift occurred due to the expansion of space.
In 1929, Edwin Hubble used the redshift of light from galaxies to calculate the velocities and distances of these galaxies from the Earth. He discovered that they were moving away from the Earth and from each other.
Cosmic Microwave Background Radiation
In 1965, Robert Wilson and Arno Penzias discovered a low, steady “hum” from their Holmdel Horn antenna (an antenna built to support NASA’s Project Echo). They concluded that the noise is Cosmic Microwave Background Radiation (CMBR), the remains of energy created after the big bang expansion.
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