public void deadRemoval() {
        ArrayList<Integer> dead = new ArrayList<Integer>();
        int i = 0;
        for (Asteroid a : asteroids) {
            if (!a.getAlive()) {
                dead.add(i);
            }
            i++;
        }
        i = 0;
        for (int d : dead) {
            asteroids.remove(d - i);
            i++;
        }
        dead.clear();
        i = 0;

        for (Laser l : lasers) {
            if (!l.getAlive()) {
                dead.add(i);
            }
            i++;
        }
        i = 0;
        try {
            for (int d : dead) {
                lasers.remove(d - i);
                i++;
            }
        } catch (Exception e) {
        }
    }