Wavelength: For a wave, the distance between two adjacent troughs or two

adjacent crests.



      Weak force: The second weakest of the four fundamental forces, with a

very short range. It affects all matter particles, but not force-carrying

particles.



      Weight: The force exerted on a body by a gravitational field. It is

proportional to, but not the same as, its mass.



      White dwarf: A stable, cold star, supported by the exclusion principle

repulsion between electrons.



      Wolfe's Blackstreak: Animal is relatively common in the Spinward

Marches. They are popular for sport or as guardian beasts for rich owners.



      World: Any inhabited astronomical body. A world can be a planet like

Terra, a planet's satellite, an airless world with domed or underground

cities, a hollowed-out planetoid, or an artificial satellite such as a space

station.