The Big Bang Ian Cintron and Rebecca Sekban What is the big bang? • It is a cosmology theory of the universe. • The big bang theory is a theory based on observation and scientific evidence. • A common misconception is that the Big Bang theory does not explain how the universe was created but rather how it was once such a small piece of space. Big Bang • The big bang was a large explosion. • It was a explosion of space, and it exploded within itself. • Temperatures and density were really high. Big Bang • Within the first few days of the universe, it was in equilibrium. • The universe cooled to a temperature where photons can not be created or destroyed. Big Bang • The theory began in 1912 American astronomer Vesto Slipher while observing a spiral galaxy, found a nebula moving away from Earth. Big Bang • In 1924, Edwin Hubble measured the distance of the nebula. He discovered that they were actually out of the Milky Way. Meaning that there was more then one galaxy. • This meant that one point in time the universe was contained in on single point in space. Big Bang • In 1931, Lemaitre, extrapolated the matter of the universe would reach an infinite density and temperature at a finite time in the past. • This means the universe must have begun in an incredibly small, dense point of matter - a "primeval atom." Big Bang • Fred Hoyle is responsible for the name “Big Bang” but he used it dismissively. Cosmic Microwave Background • CMB is left over radiation from the Big Bang. • This radiation fills the universe in the dark space. • It is the most important distinction between The Big Bang and other creation theories. Common Questions about the Big Bang • What existed before the Big Bang? • What caused the Big Bang? • Is our universe the only one? Video • Big Bang Works Cited "The Big Bang." NASA Science. Web. 19 Apr. 2011. <http://science.nasa.gov/astrophysics/focusareas/what-powered-the-big-bang/>. "THE BIG BANG." University of Michigan. Web. 19 Apr. 2011. <http://www.umich.edu/~gs265/bigbang.htm>. "Big Bang." Wikipedia, the Free Encyclopedia. Web. 19 Apr. 2011. <http://en.wikipedia.org/wiki/Big_Bang>. "HowStuffWorks "How the Big Bang Theory Works"" Howstuffworks "Science" Web. 19 Apr. 2011. <http://science.howstuffworks.com/dictionary/astrono my-terms/big-bang-theory.htm>.