GENERAL KNOWLEDGE

Detailed explanation-1: -Redshift and blueshift describe the change in the frequency of a light wave depending on whether an object is moving towards or away from us. When an object is moving away from us, the light from the object is known as redshift, and when an object is moving towards us, the light from the object is known as blueshift.

Detailed explanation-2: -The star’s spectral lines have shifted toward the ultraviolet end of the spectrum and the star is moving away from Earth.

Detailed explanation-3: -Doppler blueshift is caused by a source moving towards the observer. The term refers to any decrease in wavelength and increase in frequency caused by relative motion, including those occurring outside of the visible spectrum.

Detailed explanation-4: -A blueshift is any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to asredshift. In visible light, this shifts the color from the red end of the spectrum to the blue end.