[Gope]

They just guessed at the number of electrons, although it was a very educated guess. I would asume it went something like this -

They first used some basic knowledge of the universe like "90% is helium" "3% is hydrogen"(i just made those numbers up as examples....). They then said "element X has X number of electrons" and applied that to the above. From that point they would estimate the volume of the universe, i would asume this owuld be done based of the original size of the singularity that was in the big bang(the size of this however can only be estimated), another way to estimate volume would be to measure the amount of energy the earth recieves from the stars and then to calculate their distance and find out the amount of energy each star is actualy giving off, this would onyl be a percentage though and would have to be applied to the rest of the estimated number of stars. From this point its just putting the estimated volume and the element percentages together and doing some serious number crunching. Keep in mind that this is only my asumption of how they did this, but I am fairly certain that they did something along these lines...hope i helped and didnt confuse u


Did you know that 4.5 pounds of sunlight hits the earth every 24 hours???