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abstraction > mathematical concept > number > quantity > velocity > galactic velocity component > U velocity

U velocity
subject			fact

U velocity	has definition The component of a star's motion away from the Galactic center. If a star moves away from the Galactic center, the star's U velocity is positive; if a star moves toward the Galactic center, the U velocity is negative; and if the star moves neither toward nor away from the Galactic center, the U velocity is zero. The Sun has a U velocity of -9 kilometers per second, so the Sun is moving toward the Galactic center at 9 kilometers per second.
	is a kind of galactic velocity component
velocity	has base unit length per unit time
quantity	has unit
number	has value