Space

Question 1

Is a star moving towards us redshifted or blueshifted? Why?

Answer 1

Blue shifted because the doppler effect means that things moving towards us appear to have a higher frequency. Blue light has a higher frequency than red so the star appears more blue

Question 2

Is a star moving away from us redshifted or blueshifted? Why?

Answer 2

Red shifted because the doppler effect means that things moving away from us appear to have a lower frequency. Red light has a higher frequency than blue so the star appears more red