Listen explain the three pieces of evidence discussed in your reading that supports the Big bang theory you should say what the evidence is and how it supports
the theory
The Big Bang theory, which explains the origin and evolution of the universe, is supported by various pieces of evidence. Here are three important ones:
1. Cosmic Microwave Background Radiation (CMB):
The CMB is a faint afterglow of radiation that permeates throughout the universe. It was discovered in 1964 and is considered the oldest light in existence, dating back to about 380,000 years after the Big Bang. This radiation is almost uniformly distributed, with slight temperature variations. This evidence supports the Big Bang theory because it suggests that the early universe was much hotter and denser, eventually cooling down and expanding over time.
2. Redshift of Galaxies:
Edwin Hubble's observation of the redshift of galaxies in the 1920s provided crucial evidence for the Big Bang theory. Redshift refers to the phenomenon where light from galaxies appears to be stretched, causing a shift towards the red end of the spectrum. This indicates that galaxies are moving away from us. Hubble's observations showed that the more distant a galaxy is, the greater its redshift, suggesting that the universe is expanding. This supports the Big Bang theory's prediction that the universe originated from a singular point and has been expanding ever since.
3. Abundance of Light Elements:
The observed abundance of light elements, such as hydrogen and helium, supports the Big Bang theory. According to the theory, during the first few minutes after the Big Bang, the universe was extremely hot and dense. This allowed for nucleosynthesis, the formation of light elements through the fusion of protons and neutrons. Subsequent expansion and cooling of the universe halted this process, leaving the element abundances as a relic of the early universe. The observed abundances of hydrogen and helium precisely match the predictions made by the Big Bang theory, providing further support.
Overall, the Cosmic Microwave Background Radiation, the redshift of galaxies, and the abundance of light elements all provide strong empirical support for the Big Bang theory. Combined, these pieces of evidence strongly indicate that the universe came into existence through a hot, dense explosion approximately 13.8 billion years ago and has been expanding ever since.