How many atoms are there in the universe?

At this level, it is estimated that the there are between 1078 to 1082 atoms in the known, observable universe. In layman's terms, that works out to between ten quadrillion vigintillion and one-hundred thousand quadrillion vigintillion atoms. read more

At this level, it is estimated that the there are between 10 78 to 10 82 atoms in the known, observable universe. In layman’s terms, that works out to between ten quadrillion vigintillion and one-hundred thousand quadrillion vigintillion atoms. read more

Scientists estimate there are 10 80 atoms in the universe. Obviously, we can't go out and count each and every particle, so the number of atoms in the universe is an estimate. It is a calculated value and not just some random, made-up number. read more

The observable universe is estimated to contain 10 [math]^{78}[/math] –10 [math]^{80}[/math] atoms, which is based on an assumption for the sake of simplicity that all atoms are hydrogen atoms (which in reality makes up 74% of the universe). read more