Theories in Science Theories in science represent comprehensive explanations of some aspect of the natural world, acquired through the scientific method and widely accepted by the scientific community. The Big Bang Theory The Big Bang Theory is one of the most widely accepted models explaining the earliest development of the universe, describing how the universe began as a hot, dense point nearly 13.8 billion years ago and has been expanding ever since. Key aspects of the theory include: The universe started with a singularity - an infinitely small and dense point. A rapid expansion and cool
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