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[[Image:Stars motion.jpg|right|thumb|200px|The components of a stars motion through space.]]
[[Image:Stars motion.jpg|right|thumb|300px|The components of a stars motion through space.]]
'''Radial velocity''' is the velocity of an object that is either moving away from or towards the line of sight of an observer. If an object is approaching, it has a negative radial velocity, correspondingly if the object is moving away, it has a positive radial velocity.
'''Radial velocity''' is the velocity of an object that is either moving away from or towards the line of sight of an observer. If an object is approaching, it has a negative radial velocity, correspondingly if the object is moving away, it has a positive radial velocity.