Redshift is a term used in physics to describe the shift in the wavelength of light emitted by a celestial object moving away from an observer. Learn more about redshift and its importance in understanding the expanding universe.
Redshift is a term used in physics to describe the shift in the wavelength of light emitted by a celestial object moving away from an observer. This phenomenon is a result of the Doppler effect, where the motion of an object affects the frequency and wavelength of the waves it emits. In the context of astronomy and cosmology, redshift plays a crucial role in understanding the expanding universe.
When a celestial object such as a galaxy is moving away from an observer, the light waves it emits get stretched out, causing its wavelength to elongate. This elongation of the wavelength results in a shift towards the red end of the spectrum, hence the term redshift.
Hubble's law established the relationship between the redshift of galaxies and their distance from Earth, providing evidence for the expanding universe. By studying the redshift of galaxies and analyzing their spectral lines, astronomers can deduce the speed at which galaxies are moving away from us and gain insights into the structure and evolution of the universe.
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