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  1. What Is the Big Bang Theory? - Space

    Jan 29, 2025 · The Big Bang Theory explains how the universe began with an infinitely hot and dense single point that inflated to form the ever-expanding cosmos we see today.

  2. The Big Bang Theory Explained Simply - sciencenewstoday.org

    May 4, 2025 · The Big Bang Theory may not be the final word, but it’s the best model we have so far. And every new discovery brings us closer to answering the most profound questions of …

  3. Big Bang - Wikipedia

    The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1]

  4. What Is the Big Bang? | NASA Space Place – NASA Science for Kids

    Aug 11, 2025 · The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as …

  5. Big-bang model | Definition, Evidence, Videos, & Facts | Britannica

    Jul 30, 2025 · Big-bang model, widely held theory of the evolution of the universe. Its essential feature is the emergence of the universe from a state of extremely high temperature and …

  6. What is the Big Bang Theory? How did our universe begin?

    The Big Bang Theory is the scientific definition of the origin of the universe – the theory that tells us how the entire universe began. This theory says that our universe began as a singularity.

  7. Understanding the Big-Bang Theory - ThoughtCo

    Jun 11, 2019 · The big-bang theory is the dominant theory of the origin of the universe. In essence, this theory states that the universe began from an initial point or singularity, which …

  8. What Is the Big Bang?: Definition, Evidence, Stages, and More

    Jan 3, 2023 · What is the Big Bang? Simply put, it’s our modern understanding of the history and evolution of the universe.

  9. Does the Big Bang Theory Explain the Origins of the Universe?

    The Big Bang Theory is the most widely accepted explanation for the origins of the universe. It is supported by a variety of evidence, including the cosmic microwave background radiation, the …

  10. How the Big Bang Theory Works - HowStuffWorks

    The big bang theory is well-known, but there are many misconceptions about it. Like what? Let's start with this one: There was no bang.