A star moving AWAY from the Earth has a spectrum that is..

Shifted towards red.

Explanation:

A star is a giant astronomical or celestial object that is comprised of a luminous sphere of plasma, binded together by its own gravitational force.

It is typically made up of two (2) main hot gas, Hydrogen (H) and Helium (He).

The luminosity of a star can be defined as the total amount of light radiated by the star per second and it is measured in watts (w). Also, the apparent brightness of a star is a measure of the rate at which radiated energy from a star reaches an observer on Earth per square meter per second. The apparent brightness of a star is typically measured in watts per square meter.

Some of the examples of stars are; Canopus, Sun (closest to the Earth), Betelgeus, Antares, Vega etc.

Hence, a star moving away from the earth has a spectrum that is shifted toward red. Thus, this shift is generally referred to as a red shift and it occurs due to the fact that the wavelength of light is longer and as such increases towards red (emitting a colour wavelength of red).