Mag mines are automatic mines used in space. They launch themselves in a straight line when a target is detected and keep moving until they hit a unit.
Mag mines activate when the Hyperion approaches within their detection radius. The mine then shines a red "laser" beam at the target area, makes a sound and moves relatively slowly toward the Hyperion. The Hyperion can easily avoid a single mag mine due to its superior speed and the warning, but numerous mag mines are much more difficult to avoid. The Hyperion can use Warp Jump, but this is short range and requires a cooldown to recharge.
Tac fighters trigger mag mines and can be used to lure them away.
Some structures can even fire mag mines periodically at the Hyperion.