In the Beginning - In the Beginning slight excess of quarks...

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In the Beginning slight excess of quarks over antiquarks A little bit of matter or antimatter was left over only 6 kinds of quarks o protons – 2 ups – 1 down o neutrons – 1 up-2downs For every billion protons, there was one proton left over Electrons and positrons annihilated – formed photons neutrons begin to decay into protons, electrons, and antineutrinos Primordial nucleosynthesis o only helium was able to form o pressure and temperature didn’t stay high enough to form heavier elements Universe 75% hydrogen 25% of mass Successes of the big bang theory: o The universe is expanding o Universe has a finite age – 14 billion years o galaxies evolve with time o There is a sea of photons left over from the hot, dense beginning – cause cosmic background radiation o light elements are distributed uniformly if you look at any place that has gas you come to the conclusion that the relative proportions of hydrogen, helium, and deuterium are about even
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In the Beginning - In the Beginning slight excess of quarks...

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