What is another word for radial velocity?
Pronunciation: [ɹˈe͡ɪdɪəl vəlˈɒsɪti] (IPA) 
Radial velocity refers to the velocity of an object in a straight line towards or away from an observer. There are several synonyms for radial velocity, including line-of-sight velocity, Doppler velocity and radial shift. Astronomers use radial velocity to measure the speed and direction of stars and galaxies, and it is commonly used in astrophysics and cosmology. Some other synonyms for radial velocity include redshift and blueshift, which refer to the shift in the wavelength of light as an object moves towards or away from an observer. These terms are particularly useful for measuring the expansion of the universe and the movement of galaxies.
