Origins of the universe. 1. The ‘ Big Bang ’ theory. According to this theory our universe began 13.7 billion years ago as a singularity . Prior to this there was nothing. At this time the universe had almost infinite density and temperature.
Inflation occurs. This is an expansion of space, filled with energy. The universe suddenly becomes 100 000 000 000 000 times bigger.
BUT: It is not as much about the origin of the universe as it is about the development of the universe over time.
BUT: The origin of the universe was not an explosion of matter into already existing space. Before the Big Bang, there was nothing.
Run the story going back in time, and the sheet was more and more un-stretched and the people were closer together. When everybody is so close they are on top of one another, that is is the beginning of the big bang picture - the cosmic singularity. At that time, the universe has nearly infinite density and temperature.
The famous cosmologist P. J. E. Peebles stated this succinctly in the January 2001 edition of Scientific American (the whole issue was about cosmology and is worth reading!): "That the universe is expanding and cooling is the essence of the big bang theory. You will notice I have said nothing about an \'explosion\' - the big bang theory describes how our universe is evolving, not how it began." (p. 44).
– Red shift.
– Cosmic microwave background radiation.
– Hydrogen ± 75% and Helium ± 25%
– Detailed observations of the size, shape and distribution of galaxies and quasars is in agreement with the current state of the BBT
1965 two researchers Arno Penzias and Robert Wilson, verified the existence of Cosmic microwave background radiation. These are the ‘stretched out’ electromagnetic waves that were left over from the inflation period right at the beginning, when matter and anti-matter were annihilating each other in bursts of light.