How Many Atoms Are There in The Known Universe?
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 2×10^33 Grams, which is about 1×10^57 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 1×10^57 X 400,000,000,000 = 5×10^68 hydrogen atoms in a galaxy. There are possibly 80 billion galaxies in the Universe, so that means that there are about: 5×10^68 X 80,000,000,000 = 4×10^79 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.
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