 0.Still the CIS and Banking clan can turn out BILLIONS of droids and Last time I checked,Durasteel was strong enough to comprise nearly everything in the Galaxy.Also,A UNSC Ship would fair worse in asteroids due to its lack of shielding. Also,You have never seen a Star Destroyer move at full speed. If a captain went at full speed into asteroids,IT would essentially destroy any ship. More importantly, You cant throw asteroids so why are you acting like the Halo ships would do better inside a cloud of debris? 