1 Trevor Knauf Leeon Xie Tyler Walker Mikayla Catani Big Bang TheoryTrevor KnaufLeeon XieTyler WalkerMikayla Catani
2 What was the Big Bang?The big bang is a theory of how our current universe came to beThe big bang was NOT an explosionIt was an (and continues to be) an expansion of the universeThis expansion was faster than the speed of light. It occurred in 10 to the -32nd power seconds
3 The BeginningAfter the initial expansion, the universe was extremely hot. So hot normal atoms could not exist. Only protons, neutrons, electrons, and photons existedElectrons 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 CoolingAfter 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 linesThis caused nearly uniform light to fill the universe.
5 Formation of GalaxiesSome regions in the universe were so dense that they had enough gravity to overcome the expansion.These dense spots formed galaxies and galaxy clustersDistant galaxies are moving away from each other. But galaxies in local groups move toward each other.