How did the universe begin? Why is the universe still expanding as this essay is written right now? There are numerous questions asked about our Universe, and there are many different creations that people believe in. However, scientists are working everyday to figure out a reasonable explanation for any creation that actually created the world the way it is today. They have found one creation that many of us know very little about but has a very good chance of being the answer to why the world created the way it is today, and that creation is the Big Bang Theory because of Hubble’s Law, the Cosmic Microwave Background, and the ratios of elements found from todays universe compared to the Big Bang’s model origin. Most people throughout the world mistake the Big Bang Theory for being a big explosion and that’s how it started. However, scientists and experts say that it was not an explosion and that it was an expansion. Before the Big Bang, experts believe that space didn’t even exist, which makes most scientists believe that if it created the space, then eventually it created the world. In our space right now, galaxies are constanly moving away from planet Earth at speeds appropriate to their distance. The galaxies constantly moving is based on a concept called “Hubble’s Law,” named after Edwin Hubble. This proves that the Big Bang Theory was an expansion rather than an explosion, and it also supports that the universe was once compacted. Since “Hubble’s Law” proves that the universe was once compacted, the Big Bang caused it to expand and break apart, and create our universe. As everyone knows, the universe was initially extremely hot back then as the Big Bang Theory states. In 1965, according to radio astronomers Arno Penzias and Robert Wilson found a 2.725 degree Kelvin CMB (Cosmic Microwave Background), a remnant that scientists were looking for, for a long time. The CMB is a remnant that provides our experts in