Redshift is the phenomenon where light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum, as the object moves away from the observer. It is a crucial observational evidence for the expansion of the universe and supports the Big Bang theory.

Redshift

Phenomenon where light is increased in wavelength

Electromagnetic radiation is a form of energy that travels through space at the speed of light, encompassing a wide range of wavelengths and frequencies known as the electromagnetic spectrum. It includes visible light, radio waves, X-rays, and more, each with unique properties and applications in fields like communication, medicine, and astronomy.

electromagnetic radiation

shifted to the red end of the spectrum

object moves away from the observer

observational evidence for the expansion of the universe

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

supports the Big Bang theory

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.

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