GENERAL KNOWLEDGE

Detailed explanation-1: -’Red shift’ is a key concept for astronomers. The term can be understood literally-the wavelength of the light is stretched, so the light is seen as ‘shifted’ towards the red part of the spectrum. Something similar happens to sound waves when a source of sound moves relative to an observer.

Detailed explanation-2: -redshift, displacement of the spectrum of an astronomical object toward longer (red) wavelengths. It is attributed to the Doppler effect, a change in wavelength that results when a given source of waves (e.g., light or radio waves) and an observer are in motion with respect to each other.

Detailed explanation-3: -As objects move away from us, their light gets shifted into longer wavelengths or the red end of the spectrum-that’s redshift. Blueshift is the opposite, when light is shifted to shorter wavelengths on the blue side of the spectrum as an object comes towards us.