Saw this hilarious idea on battleshipgalaxians.com:
[quote="Filthy the Clown"][quote="OldSarge"]I saw some asteroids on sale somewhere for another game system. I might get those. Or buy my own Styrofoam balls & make some up. Maneuvering around the terrain is one thing, but having the terrain maneuver around YOU?
Or maybe those@#$% gum-balls that fall out of that tree in the front yard. They look lethal...[/quote]
Asteroids with random movement tables, just to spice it up a bit. Or,just roll them across the board, destroying anything in their path. [/quote]
I'd suggest the asteroids move in more or less the same direction for the duration of the game...it sounds strange to me that a 'roid might be floating away from me one round, then suddenly drift the opposite direction, right into my ship
...of course I'd then suggest that every now and then, more roids spawn on the edge of the map that's opposite the direction they are moving
That would work too. You could roll after each set of turns to see if an Asteroid enters the board and from what side of the map (like 1/2/3/4 referring to the four sides of the map and 5-10 = no asteroid), then determine what "row" it starts in along that side via dice. Then have it travel in a straight line across the board moving X hexes per turn (could even randomize this via dice if so inclined), exiting on the other side.
I definitely wouldn't play this way all the time, but it would make for a fun occasional "Asteroid Field" scenario different from the one in the rulebook.