Question: If an object is moving, relative to an observer, what do we mean when we talk about the object's radial velocity? The motion at right

If an object is moving, relative to an observer, what do we mean when we talk about the object's radial velocity? The motion at right angles to the line of sight between the observer and the object The rotational motion of the object as it spins on its axis The motion along the line of sight between the observer and the object The motion of the object due to the expansion of the universe

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