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The most common theory of why the Universe was created is the Big Bang. The Big Bang theory is that it all started with one atom. In the first 10^-43 seconds of the universe the universe was very small, so small that it was smaller than an atom. However in a less than a second all the matter and energy started to expand pretty evenly across the universe and this cosmological inflation is the reason why there is a consistent temperature matter across the universe. The rate of expansion slowed down but after more time had passed a lot more types of particles are had been created and these particles was able to form stars and galaxies. During this time there was a lot of radiation and the colliding photons created both matter and antimatter particles. As the universe cooled down it there was a disbalance in the matter and antimatter. After the first second of the universe, cosmological nucleosynthesis took place where the protons and neutrons came together to form the nuclei of Hydrogen and Helium which took most of the matter in the universe. The universe was still too hot at this time for electrons to stay in atoms and it took 380,000 years for it cool down and for electrons to join the atom. This period is called the recombination. The WMAP was able to figure out how old the universe is and also how the universe rapidly expanded after the atoms got together. 72 Km/s/Mpc is the Hubble constant which is used to figure out the speed of a galaxy that is a megaparsec away.
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