Big Bang Theory

Physical Science Grade 11 or 12 ABM Strand K-12 Senior High School (Curriculum Guided)

1. Physical Science 12 ABM Prepared By: Jerome A. Bigael , Leyte Progressive High School Lesson 1 (Big Bang Theory)

2. Big Bang Theory

3. Abbe Georges Edouard Lemaître (1894-1966) Belgian cosmologist and priest Born in 1894 in Charleroi, Belgium professor of physics at the Catholic University of Leuven He proposed the theory of the expansion of the universe, widely misattributed to Edwin Hubble.

4. Give Your Insights “The Big Bang model is not a theory of the origin of the universe, as it is often described, Rather it is a description or model of the early universe.”

5. Misconception: The Big Bang is not a theory of the origin of the universe, as it is often described. Rather, it is a description or model of the very early universe. The Big Bang was not an explosion of matter.

6. What is Big Bang Theory? The Big Bang Theory is a description or model of the very early universe. This theory explains that the universe developed 13.7 billion years ago and started as a very dense and hot “ singularity ” which eventually cooled and began to form different particles. The term Big Bang does not imply that there was an explosion but the truth is that there was an expansion.

7. Three Observational pieces of evidence that support Big Bang Model: 1. Hubble or Cosmic Expansion Edwin Hubble, an American astronomer in the 1930’s made a major discovery at Mount Wilson Observatory in California, USA with the use of 100-inch Hooker Telescope.

8. Hubble and his assistant, Milton Humason , formulated Hubble’s law ( also known as Hubble expansion ).

9. It states that other galaxies are moving away relative to the Milky Way galaxy at a rate of proportional to distance, was the first observational evidences of Lemaître’s Big Bang Model.

10. 2. Cosmic Microwave Background George Gamow , a theoretical phycisist and cosmologist in 1940’s.

11. Together with Robert Herman and Ralph Alpher , predicted that if the early stage of the universe was hot and dense, then an afterglow of radiation must have filled up the universe brought about by the cooling process.

12. This Afterglow is detected today as the Cosmic Background Radiation also known as the Cosmic Microwave Background (CMB).

13. In 1964, two radio astronomers of Bell Laboratories in New Jersey, USA-Arno Penzias and Robert Wilson confirmed the presence of the CMB with an average temperature of 2.7 Kelvin.

14. Primordial or Big Bang Nucleosynthesis (BBN) Gamow, Herman and Alpher also believed that the high temperature of the universe is an appropriate condition for nuclear processes to occur during the first few minutes of Big Bang.

15. The process began with the fusion of protons and neutrons to form nuclei in a process known as “ nucleosynthesis ”. Primordial or Big Bang Nucleosynthesis refers to the process of producing the “light elements” shortly after the Big Bang.