The Big Bang theory posits that the universe began approximately 13.8 billion years ago from an extremely hot and dense singularity. As it expanded, the universe cooled, allowing energy to convert into subatomic particles and eventually atoms, primarily hydrogen and helium. Over time, these gases condensed under gravity to form stars and galaxies. This ongoing expansion, along with phenomena such as cosmic microwave background radiation and the abundance of light elements, provides strong evidence for the Big Bang as the foundational event in the universe's origin and evolution.
Question
In three to five sentences, briefly describe how the big bang theory explains the origin and evolution of the universe.(4 points)
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