Star light blue shift

 Blue shift is the opposite of redshift in astronomy, where the light emitted by an object appears to have shifted towards shorter (bluer) wavelengths due to the Doppler effect caused by the object's relative motion towards the observer.

When an object is moving towards the observer, the waves of light it emits are compressed, resulting in a shorter wavelength and a higher frequency. This causes the light to appear bluer than it would if the object were at rest. The amount of blue shift is proportional to the object's speed towards the observer.

Blue shift is also a crucial tool for astronomers, as it can be used to measure the speed and distance of objects in the universe. By analyzing the blue shift of an object's light, astronomers can determine the object's velocity and direction of motion relative to the observer, and use this information to study the structure and evolution of the universe.