"Just to give you some perspective on how many atoms it might be, the number of atoms alone in the graphite in your pencil is about 25000000000000000000000 atoms. But, we should probably give you a number to use, just in case you are interested. This won't include dark matter, brown dwarf stars, dwarf galaxies and such, but we will count the atoms in a star and multiply this by the number of stars in the Universe, since that is mostly what we can see when we look out. A typical star weighs about 2x10^33 Grams, which is about 1x10^57 atoms of hydrogen per star... That is a 1 followed by 57 zeros. A typical galaxy has about 400 billion stars so that means each galaxy has 1x10^57 X 400,000,000,000 = 5x10^68 hydrogen atoms in a galaxy. There are possibly 80 billion galaxies in the Universe, so that means that there are about: 5x10^68 X 80,000,000,000 = 4x10^79 hydrogen atoms in the Universe. But this is definately a lower limit calculation, and ignores many possible atom sources. That number is a 4 followed by 79 zeros." http://www.madsci.org/posts/archives/oct98/905633072.As.r.html http://www.sunspot.noao.edu/sunspot/pr/answerbook/universe.html

Quite a few.

10 to power 60. Although this is an estimate of the KNOWN universe.

If you believe in the cosmic egg theory, the amount of atoms (or the energy equivalent) would be 1 followed by 89 zeros. That corrisponds to the primordial 'heavy' atom dividing by 2, 10 times in each of 27 steps.

WOW!!! thats a completely uncalcuable answer, since we dont even know how big the universe is. Even if we did I dont think anyone could answer this question with anything other than an opinion.

4 X 1068 X 8 X 1010 = 3 X 1079

10^85 approximately I believe that this will be proven to be a gross underestimate as we discover further galaxies and even universes. And black holes of course, how can we even begin to measure these?

To quote Carl Sagen "billions and billions and billions..." Actually times a few billions of billions.

The amount of Hydrogen atoms being around 4*10^79, which is about 74% of all of the atoms in the universe. This gives us around 5.41*10^79 atoms in total.

One. It simply exists in many places simultaneously. :)

Lots

I don't think we have numbers that big.

No way to measure. Humans don't even have an accurate estimate of how large the universe is.

Googleplex (10 to the 1,000,000 power)

There are over one billion in the width of a piece of paper (that's tha part you get paper cuts on). So....a lot, I guess.

How much time do you have?

Quite a few.

There are 11 atoms in the known universe.

you are all way off. there are 876567156752200475756776661534877309802732897634287462487235648298098154823154287443244346766570808 atoms in the known universe. i counted them.

A Gazillion or perhaps a Krillion of them.

With all the atoms that disappear into black holes, then moving through worm holes and reappearing in parallel universes, there is such a to-ing and fro-ing that I haven't managed to get an exact count. It's certainly a challenge.

The observable universe (not including black holes and other unobservable objects)is probably between 0.79 and 0.81 googols according to Wikipedia(a googol being 1 followed by 100 zeros. (I dont know of any more accurate estimate than this).