Let's start with why it should be intercepted outside the atmosphere. Ballistic missiles are high, fast, long-range, and incredibly destructive, especially Iran's medium-range ballistic missiles, which may have entered outer space at an altitude of more than 100 kilometers. Extra-atmospheric interception, simply put, is to kill the missile in advance before it falls and hits the target. It's like blocking the enemy on the hill before he enters the village, so as to prevent trouble. Ballistic missiles generally have three phases: