Redshift

Redshift is a term used in astronomy to describe the phenomenon where the spectral lines in the light emitted by an object shift towards the red end of the spectrum. This occurs due to the Doppler effect, which is the change in frequency of light or sound waves as the source moves away from the observer. In the context of astronomy, redshift indicates that an object is moving away from the observer, which is a key piece of evidence supporting the theory of the expanding universe. The term "redshift" can be translated to Hebrew as הדגמת אדום (hadgemat adom). In other languages, it is known as Rötverschiebung in German, rougissement in French, and desplazamiento al rojo in Spanish. The measurement of redshift is crucial in cosmology, as it helps astronomers determine the distance and velocity of celestial objects, providing insights into the structure and evolution of the universe. The most famous classification of redshift is the Hubble sequence, which categorizes galaxies based on their redshift values, helping to understand their formation and development over time.