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Timeline of the Universe

I will describe what some think is the formation of the universe.

Hannah Snyder

on 4 March 2011

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Transcript of Timeline of the Universe

Timeline of the Universe lepton epoch Photon Epoch The beginning of the big bang, it was nothing more than a speck This is the closest that current physics can get
to the absolute beginning of time, and still
very little is known about this time period.
It is said to be no bigger than the tip of a pencil. Grand Unification Epoch Gravity separates from the other fundamental forces. Inflationary Epoch The universe undergoes a rapid exponential expansion. Electroweak Epoch Quark Epoch Hadron Epoch As the strong nuclear force separates from the other two, particle interactions create large numbers of exotic particles. electrons and neutrinos form in large numbers as the universe cools off to below 10 quadrillion degrees and the four fundamental forces assume their present forms. The temperature of the universe cools to about a trillion degrees, cool enough to allow quarks to combine to form hadrons. electrons and and positrons collide and annihilate eachother, energy in the form of photons is freed up and colliding photons in turn create more electronn-positron pairs. Neucleosynthesis The temperature of the universe falls to a point where atomic neclei can begin to form as protons and neutrons combine through neclear fusion to form the nuclei of the simple elements of hydrogen, helium and lithium. the universe is filled with plasma, a hot, opaque soup of atomic nuclei and electorons. Recombination/Decoupling by the end of this period, the universe consists of fog of about 75% hydrogen and 25% helium, with traces of lithium. Dark Age Reionization the period after the formation of the first atoms and before the first stars the first quasars form from gravitational collapse, and the intense radiation they emit. Star and Galaxy Formation solar system formation TODAY!
the expansion of the universe and recycling of star materials into new stars continues. sll forming today! Hannah Snyder
Casey Sexton Created by:
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