A star destroyer can level a planet by itself, Blue shadow virus is deadliest weapon actually (kills any organic life form) There are other super weapons. Death star OBLITERATES planets (other than an object 66% the density of the planet crashing into it, a star, or a black hole, NOTHING ELSE aside from the force, can do that in star wars universe!) Destroy a planet big deal huh? THE 18 HALO RINGS only obliterate nervous systems of every un shielded organic human life form in 1 galaxy with sub atomic radiation that in quantum physics DOESNT ACTUALLY WORK. So even that DOES NOT break down or cause a reaction as severe as the death star super laser when it hits a planet. (100,000x one TRILLION human beings worth of nervous systems DOESNT even equal the mass of MARS (1/3 the size of earth 1/3 to 1/5 the mass of earth) DO SOME MATH.