How does redshift relate to the Big Bang?

The Big Bang theory states that the universe started as a hot, dense point and has been expanding ever since. The observation of redshift in distant galaxies supports this theory, as it suggests that the universe is expanding, consistent with the predictions of the Big Bang model. Redshift is a phenomenon in which light from distant galaxies appears to be shifted towards longer wavelengths. This is interpreted as evidence that the universe is expanding, and the further away a galaxy is, the greater its redshift.

Redshift is a phenomenon in which the light from distant galaxies appears to be shifted towards longer wavelengths, or "redder" colors, as it travels through expanding space. This effect is known as cosmological redshift and is a key piece of evidence supporting the Big Bang theory. According to the Big Bang model, the universe began as an extremely hot and dense singularity approximately 13.8 billion years ago and has been expanding ever since. As the universe expands, the wavelengths of light traveling through it also stretch, causing a redshift.

The relationship between redshift and the Big Bang is described by Hubble's law, which states that the velocity at which a galaxy is moving away from us is directly proportional to its distance from us. This relationship implies that the universe is expanding uniformly in all directions, consistent with the predictions of the Big Bang theory. Observations of cosmological redshifts provide compelling evidence that the universe is indeed expanding and has been doing so since the Big Bang.

In summary, redshift is a phenomenon caused by the expansion of the universe, and its relationship with the Big Bang is a cornerstone of modern cosmology. The observed redshifts of galaxies support the idea that the universe began with a hot, dense state and has been expanding ever since, providing strong evidence for the validity of the Big Bang model.