The Evidence Supporting the Big Bang Theory: Redshift and the Expanding Universe

The video discusses the expanding universe, focusing on red-shift as evidence for the Big Bang Theory. It explains how red-shift indicates galaxies moving away from Earth, supporting the idea of an expanding universe. The Big Bang Theory is introduced, suggesting the universe began from a dense, hot region. Cosmic microwave background radiation is presented as further evidence, being red-shifted radiation from shortly after the Big Bang. Hubble's Law is explained, showing the relationship between galaxy speed and distance, leading to the Hubble constant, which helps estimate the universe's age.

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