Mine
this was the generic term used to describe a detonation device that can be distributed into open space and left there, lying in wait for unsuspecting ships to pass by. There are many different kinds of mines. Most were considered passive, or contact, mines: they sat in space until a passing ship physically touched them, at which point they exploded. Some were heat-seeking mines, armed with lasers that are targetted to the source of heat. There were also combination mines, designed to explode on contact but also armed. There were three kinds of combination mines: Type A, a 15-meter-long mine armed with a single laser cannon and a 5-RU hull; Type B, similar in armament to the Type A mine, but with a different shape; and Type C, a 5-meter-long mine armed with a single laser cannon, a warhead launcher, and a 5-RU hull. The rarest kind of mine, known simply as an active mine, was equipped with proximity sensors and a propulsion system. Whenever a large object triggered a proximity alarm, an active mine homed in on it and moved to intercept it. This characteristic made active mines difficult to deploy and maintain, leading to their limited deployment.