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Astrophysics applies the principles of physics and chemistry to understand the universe, including the formation and evolution of the universe as conceptualized by the Big Bang theory.
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Cosmology forms the fundamental principles upon which the Big Bang Theory is based, shaping our understanding of the universe's origin and evolution.

Big Bang Theory

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The Big Bang Theory is a scientific model that describes how the universe expanded from an extremely high-density and high-temperature state. It provides a comprehensive explanation covering various cosmic phenomena.

Introduction to Big Bang Theory

The Big Bang Theory, often credited to Belgian physicist Georges Lemaître, proposes that the universe started from a singularity - a point of virtually infinite density and temperature. This big 'bang' event took place approximately 13.8 billion years ago, and since then, the universe has been expanding.

Aspects of the Big Bang Theory

  • Cosmic Microwave Background: The theory predicts the existence of cosmic microwave background radiation. This radiation is uniform and isotropic to roughly one part in 100,000.
  • Formation of Galaxies: The Big Bang Theory explains the formation of galaxies and large-scale structure in the universe.
  • Hubble's Law: The observations of galaxies receding from our own, with a speed proportional to their distance, aligns with the theory's predictions.

Limitations of the Big Bang Theory

Although the Big Bang Theory is widely accepted, it does not explain what initiated the creation of the universe, nor does it explain certain quantum mysteries at the singularity from which the universe supposedly sprang.

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Cosmic Microwave Background
The cosmic microwave background (CMB) is evidence supporting the Big Bang Theory. As the universe cooled and expanded after the Big Bang, it led to the cosmic microwave background we observe today.
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Universe Expansion
The concept of universe expansion is a critical component of the Big Bang Theory, as the model describes the universe as expanding from a dense, hot state.
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Cosmic Background Radiation
The Big Bang theory predicts the existence of cosmic background radiation. This is an afterglow or remnant from the time the universe was very small, hot and dense.