1. Trevor Knauf Leeon Xie Tyler Walker Mikayla Catani
Big Bang Theory
Trevor Knauf
Leeon Xie
Tyler Walker
Mikayla Catani

2. What was the Big Bang?
The big bang is a theory of how our current universe came to be
The big bang was NOT an explosion
It was an (and continues to be) an expansion of the universe
This expansion was faster than the speed of light. It occurred in 10 to the -32nd power seconds

3. The Beginning
After the initial expansion, the universe was extremely hot. So hot normal atoms could not exist. Only protons, neutrons, electrons, and photons existed
Electrons caused photons to scatter continuously.
The photons would link to the electrons, causing the universe to glow.
Scientists called this stage the “primordial” or “quark” soup

4. Cooling
After about 300,000 years the universe finally cooled enough for atoms to form.
This allowed the atoms hydrogen and helium to be created.
Finally photons could move in straight lines
This caused nearly uniform light to fill the universe.

5. Formation of Galaxies
Some regions in the universe were so dense that they had enough gravity to overcome the expansion.
These dense spots formed galaxies and galaxy clusters
Distant galaxies are moving away from each other. But galaxies in local groups move toward each other.

6. Universe Timeline

7. Bibliography http://big-bang-theory.com/