Asteroid belt
From Tardis Wiki, the free Doctor Who reference
An asteroid belt is the region of a star system which is occupied by asteroids. The Sol system's asteroid belt was located between Mars and Jupiter, formerly the site of the orbit of Planet 5. (DW: Image of the Fendahl) During the Great Breakout of 5000, many frontiersmen and pioneers were concentrated in the asteroid belt while waiting to spread out in the Galaxy. (DW: The Invisible Enemy)
