how many atoms are there in the universe and if its not to much trouble how many particles?

Answer 1

Gosh. A sensible question, and you have to put up with fourteen completely dumb-cluck answers until one that is actually CORRECT. The number of elementary particles in the universe is quite a modest number, and well-reasoned estimates of around 10^80 give or take a factor of 10 have been around for nearly a century.

Most of the Universe is hydrogen, so troothskr's 2 x 10^79 hydrogen atoms converts to 4 x 10^79 particles. Adding photons, neutrinos, and dark matter, it is still unlikely to exceed 10^81.

Answer 2

Apparently the number of atoms in the "known" universe is just short of 1 googol. Which is 1 followed by a hundred zeros. Obviously nobody as counted this by hand. It's not even possible to count 1 mole of atoms which is 6.23*10^23 in a single lifetime, but it has been calculated.

As for particles... that is something I have no idea about, and don't know anyone that does.

Answer 3

Depends whether our universe is 'open' (expands indefinitely) or 'closed' (gravitational collapse eventually- big crunch!). This is my way of figuring the formula. Einstein gets a similar result.It's based on the escape velocity of a particle at the edge of the expanding universe. I'm assuming v(esc)= RH where R=radius of universe and H= Hubble constant.
Grav Potential of Universe V=GM/R=v^2/2 (non rel approx). Subst v=RH and M=4Pi*R^3*Rho/3
(rho=density) gives
rho= 3*H^2/(8*Pi*G) as the limiting density.
Using best estimate of H and R (H=inverse of age of universe =13/14 x 10^9 years) gives approx 3 hydrogen atom masses per m3, and using vol of universe gives No. of Hydrogen atoms= 2x10^79. Big problem...observing other galaxies, and knowing the stellar masses from their luminosity, and observing their rotational speeds if doppler shift stuff works, implies that not all the mass is accounted for. So..(still there?)..the actual mass of the universe could due to up to 90% exotic non atomic matter and 10% Hydrogen (strings, monopoles?). And remeber if its a 'closed' universe the density>3H^2/(8*Pi*G) and less if its an 'open' universe.

Answer 4

Someone with a lot of time on their hands has come up with a formula to calculate the number of atoms in the universe. I saw it on a documentary on Discovery, its gotta be true.

Wait, it could have been the mass of the universe. I suppose you could figure the number of atoms if you had the mass to start with. maybe.

Answer 5

26

Answer 6

well,i want to correct something.....atoms and particles are nothing different..they are same...particles can be anything among atoms, molecule or compound...so "particle" isnt specific and as far as your question is concerned,the universe is an infinite space.so its impossible to calculate the no. of atoms in this colossal universe...maybe there are zillions and zillions of it!

Answer 7

its no trouble at all....there are around 13 atoms and about 29 or so particles..i could be wrong so don,t take my word for it

Answer 8

as the universe is infinite then there are an infinite amount of atoms and particles,it never ends.

Answer 9

Are you became Crazy? Here will confused to find the atom number if a 1gm compound is given And you want to know
the number of atom in whole universe thats funny.
Your answer is it is infinite.....................

Have a nice day..

Answer 10

even if i pressed 1 followed by zeros until i got bored, that would not be enough.
There are well over a million times more stars (known to date) than are visible in the sky with the naked eye. Go figure !

Or ZERO ?! all visible or matter that we consider as matter is cancelled out by all the opposite (invisible) dark matter and if it all came together, it would cancel each other out...