In the field of Astronomy, the study of the cosmos, scientists are tasked with explaining the origin of the universe. There currently most accepted explanation is referred to as The Big Bang Theory. This theory hypothesizes that the universe began as an exceedingly dense and hot cosmic object called a singularity. A singularity is matter that is compressed into indefinite density and temperature. All the contents of the universe were compressed under tremendous pressure, temperature, and density into a singularity of extremely small volume. To picture the idea of a singularity, imagine all the people in the world today smashed into a space the size of a school locker. In a matter of moments, this singularity released, and the universe rapidly expanded, forming all the matter in existence. The universe expanded with infinite speed, and all the energy rushed outward to fill that expanding volume. As a result, the universe began to cool down. This cooling released energy called cosmic microwave background energy. The universe is still cooling, expanding, and even banging today, moving galaxies apart at an accelerating pace.
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