Cosmological redshift is the phenomenon where light from distant galaxies is shifted towards the red end of the spectrum due to the expansion of the universe. This effect provides crucial evidence for the Big Bang theory and allows astronomers to determine the rate at which the universe is expanding, known as the Hubble constant.

Cosmological Redshift

Cosmological redshift

light from distant galaxies

red end of the spectrum

The expansion of the universe refers to the observation that galaxies and other cosmic structures are moving away from each other, suggesting that the universe has been growing since the Big Bang. This phenomenon is supported by the redshift of light from distant galaxies and is a fundamental aspect of modern cosmology, indicating that space itself is stretching over time.

expansion of the universe

The Big Bang theory is the prevailing cosmological model explaining the universe's origin from a singularity approximately 13.8 billion years ago, leading to its ongoing expansion. It provides a comprehensive framework for understanding the cosmic microwave background radiation, the abundance of light elements, and the large-scale structure of the cosmos.

Big Bang theory

evidence for the Big Bang theory

Rate of expansion of the universe

The Hubble Constant is a measure of the rate at which the universe is expanding, expressed as the velocity per unit distance. It is crucial for determining the size, age, and ultimate fate of the universe, but its exact value remains a topic of debate due to discrepancies between measurements from different methods.

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