No i stated 4.5x10^18 average 70 kilo under 1g mass worth of life forms DOES equal the mass of mars because it does almost (its off slightly due to rounding) Yes certain alien species have DIFFERENT DENSITIES than others DENSITY does NOT equal MASS. Sure granted some species may be 99 kilos per life form under 1 earth g meaning that species IS more massive YES, but 4,500,000,000,000,000,000 70 kilogram under 1 earth g humans would require: 4,500,000 x ONE TRILLION populated systems in the galaxy! (I see now i WAS off on 1 place value on that part) thats 4.5 MILLION PLANETS WITH 1 TRILLION LIFE FORMS EACH IN BOTH STAR WARS AND HALO There are only a few thousand populated worlds! So there is MORE than enough wiggle room for different species of life forms under different gravities. As far as disintegration/displacement E=MC^2 You can figure out EXACT NEWTONIAN FORCE produced/required using the numbers ive provided