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'''Alien Worlds''' are non-human and non-Imperial worlds inhabited by alien races. Humanity is just one of many races in the galaxy, but none are so widely distributed or so numerous as humans. Most alien races occupy only a single world or a small group of worlds. The majority of aliens are comparatively primitive, peaceful or powerless, and of little interest to humanity. Only a few alien races are powerful, aggressive and possess technology which rivals that of the Imperium. Of these, the most common are the [[Ork]]s, [[Eldar]] and , [[Tyranid]]sand [[Tau]].