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| abstraction > mathematical concept > number > quantity > velocity > galactic velocity component > W velocity | 
| W velocity comparison table | ||
| Subject | is a kind of | has definition | 
|---|---|---|
| galactic velocity component | velocity | One of three components of a star's motion with respect to the center of a galaxy. | 
| W velocity | galactic velocity component | A star's velocity perpendicular to the Galactic plane. If a star is moving up, its W velocity is positive; if a star is moving down, its W velocity is negative; and if a star does neither, its W velocity is zero. The Sun has a W velocity of +7 kilometers per second, so it is moving up at 7 kilometers per second. In general, the greater a star's W velocity when it crosses the Galactic plane, the farther above and below the plane the star will travel. | 
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