What arew redshift and blueshift why are these effects useful in the study of the universe?

Redshift and blueshift refer to the changes in the wavelength of light emitted by objects in space due to their motion relative to an observer. Redshift occurs when an object moves away, causing its light to stretch to longer wavelengths, while blueshift happens when an object moves closer, compressing the light to shorter wavelengths. These effects are crucial for understanding the universe, as they allow astronomers to determine the speed and direction of celestial objects, leading to insights about the expansion of the universe and the dynamics of galaxies. By analyzing redshift and blueshift, scientists can infer distances, measure the rate of cosmic expansion, and study the movement of stars and galaxies.