Black Hole is a StarCraft map for 8 players. It is designed for allied play. One group are called the "Alliance" and the other called "Station Riffraff".
A large "black hole" (created by trigger) lies in the center of the map. Air units nearby move to its center, where they are destroyed.
This station is an in-joke based on the titular space station of the science fiction TV series, Babylon 5 (which was also built to establish peace among different species, and failed in some cases).
1999-06-04. Black Hole. Battle.net StarCraft Map Compendium.