When a star is moving away from Earth, its light is redshifted. This means the wavelengths of its light are stretched, making the star appear redder than it actually is.

Here's why:

* Doppler Effect: The Doppler effect is a phenomenon where the frequency of waves (like light) changes depending on the relative motion of the source and the observer.

* Moving Away: When a star moves away from Earth, the light waves are stretched out, decreasing their frequency. This corresponds to a shift towards the red end of the electromagnetic spectrum, hence "redshift".

* Measuring Distance: By measuring the amount of redshift, astronomers can estimate how fast a star is moving away from us and ultimately, how far away it is. This is a key tool in understanding the expansion of the universe.

So, while a star doesn't have a specific name for its movement, "redshift" describes the phenomenon that reveals its motion away from Earth.