in this video clip the men in the end says the there are much more atoms in a serial of sand 보다 stars in the (observable) universe. My estimation with this:100 bilions of galaxies100 bilions of stars every galaxy

So, 10000 bilion that bilions that stars in the observable universe=$10^22$

For a common grain that sand (size 1mm) do of Si02 , the estimate is $10^19$ atoms... If a grain is a fraction of mg, 1 g that grain has truly an ext atoms 보다 stars in the universe.

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Do you have actually some an excellent estimate?



What the guy in the video was speak was many likely simply an estimate, not specific figure. Nobody knows how many starts over there are specifically in the universe, however your guess: v of 10^22 appears fair.

To find how much grain of sand friend would need to have 10^22 atoms, merely using molar fixed conversions. Usage Avogadro"s Number to walk from 10^22 atom to # that moles. Then use the molar mass of SiO2 to walk from # moles to grams. Mine calculations (with the units in interlocutor canceling each various other out):

10^22 atoms * (mol / 6.02 x 10^23 atoms) = 0.0166112957 mol

0.0166112957 mol * (60.1 g / mol) = 0.9983388704 g

So going by your calculation of 10^22 stars in the universe, you would certainly need about 1 gram of sand to have actually an equal number of atoms (assuming the sand is totally made increase of SiO2).


The variety of stars in the observable universe has been questioned in the question just how do we calculation $10^23$ stars in the observable universe? mine answer come this go little an ext than repeat the standard wisdom, however Pulsar"s answer gift a really interesting alternate approach the ends up at about the very same number. The number of stars in the observable universe turns out come be about $10^23$, however this is a pretty loose approximation and also it could easily be an order of magnitude higher or lower.

The number of atoms in silicon dioxide have the right to be rather much more precisely determined due to the fact that the molecular weight of silicon dioxide is $60$, therefore $60$ grammes has $3 imes 6.023 imes 10^23$ atoms, i m sorry is around $1.8 imes 10^24$ atoms.

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So $10^23$ atom is about 3.3 grammes of sand. But bear in mind the order the magnitude skepticism in the variety of stars.