Actually the halo rings obliterates all sentient life down to the atomic level. It doesn't attack the nervous system only. It simply reduces humans and every other form of sentient life into gas and dust. So yea......I think that if, you take every single sentient being in the galaxy, they would weight a lot more than Mars and probably more than any terrestrial planet.
And those shields are specifically made around certain outposts to keep the effects of the halo out I border to re-seed the Galaxy. So just any old shield won't do. It has to be made with the technology of halo on mind.
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Edited by DarthBrando: 9/5/2015 8:00:00 AMWeight/mass of mars in metric tons: 6.39 × 10^20 t Average weight of 1 adult human: 70 kilos (1,000 kilos for 1 ton) Thats 14 people for 1 metric ton: Weight/mass of mars: 639,000,000,000,000,000,000 metric tons Thats: 4,500,000,000,000,000,000 adult humans (450,000x 1 trillion exactly) So no the weight of ALL human life forms in ONE galaxy (if each world holds a trillion thats 450,000 of them roughly) IS Barely equal to the weight of mars! (My original guess was 100,000x a trillion, you need 4.5x that JUST to get close to mass of mars and mars is a SMALL planet! Thats also FULL body weight not just nervous system)