If the incoming projectile were a white dwarf—a superdense star that packs the mass of the sun into a body a hundredth the size—the residents of Earth would be treated to quite a fireworks show.
On condition that the front body shape of the projectile is unchangeable,a formula is obtained for determining the relation between the optimum boattail angle and the supersonic flight region.
Based on the principle of compound pendulum,the measurement method and corresponding equipment for the centroidal deviation and the rotary inertia of rocket projectile were described.
A nation might want to want a weapon like that because in theory, it would fly fast enough to get through missile defense systems, which are designed to shoot down incoming projectiles.