To write this up fully (the overly long and detailed way):
Special Terrain: (The Void of) Space
Effect: Deadly Terrain: Space terrain is potentially lethal, and should be avoided at all costs. When a unit without some sort of life support touches space terrain or starts its turn touching space terrain, it makes a Skill roll (Use 6). If it fails the roll, it takes one wound* automatically, or 1d6 wounds if the roll was a 1.
Special: Momentum: While touching space terrain, a unit without a Flight speed (with rockets, or otherwise usable in space) must move the same speed and direction that he did on his last turn. As an action, the unit can throw a held object in any direction and make a Skill roll. The unit moves that many inches in the opposite direction of the thrown object, or 1d6" in a direction chosen by an opponent if the roll is a 1.
Special Terrain: Vacuum (of Space)
Effect: Attractive Terrain: When a unit moves within 12" of a vacuum breach or starts its turn within 12" of a vacuum breach, it makes a Skill roll (Use 6). If it fails, the target is pulled 8 - the roll inches toward the vacuum breach.
Special: Grab on!: A unit with a free hand (or who drops whatever he was holding to make a free hand) can grab onto any object he can reach before he makes his Skill roll. If the object is larger than the unit, he gets +1 Skill for the roll. If the roll fails, the unit loses its grip on the object, or part of the object breaks off and flies with him if the roll is a 1.
* - To put it as simply as possible, a "wound" is equivalent to the unit taking damage greater than its Armor roll exactly once.
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