Table of Contents
How did we calculate the number of atoms in the universe?
For the observable universe, we know that there are approximately 1011 galaxies. We will find the number of atoms in the universe by multiplying the number of atoms in our galaxy by the number of galaxies in the universe. The total number of atoms in the universe then comes to… 1078!
How many atoms are there in the Milky Way galaxy?
Our galaxy, the Milky Way, contains approximately 100 to 400 billion stars. If we take this as 200 billion or 2 × 1011 stars and assume that our sun is a reasonable average size we can calculate that our galaxy contains about (1.2 × 1056) × (2 × 1011) = 2.4 × 1067 atoms.
How many atoms in the universe are there?
There are between 1078 to 1082atoms in the observable universe. That’s between ten quadrillion vigintillion and one-hundred thousand quadrillion vigintillion atoms.
What is the formula for calculating number of atoms?
To calculate the number of atoms in a sample, divide its weight in grams by the amu atomic mass from the periodic table, then multiply the result by Avogadro’s number: 6.02 x 10^23.
What is the size of the known universe?
93.016 billion light years
Observable universe/Diameter
How do you calculate the number of atoms in the universe?
Explanation of How the Number of Atoms Is Calculated. The Sun contains approximately 10 57 atoms of hydrogen. If you multiple the number of atoms per star (10 57) times the estimated number of stars in the universe (10 23 ), you get a value of 10 80 atoms in the known universe.
How many hydrogen atoms are there in the universe?
It is believed 74\% of the mass of the Milky Way, for example, is in the form of hydrogen atoms. The Sun contains approximately 10 57 atoms of hydrogen. If you multiply the number of atoms per star (10 57) times the estimated number of stars in the universe (10 23 ), you get a value of 10 80 atoms in the known universe.
What is the mass of the known universe?
Mass of the Known Universe. A related number is the estimated mass of the universe, which is calculated to be 10 53 kg. This is the mass of atoms, ions, and molecules and excludes dark matter and dark energy.
How many atoms are there in a galaxy?
If we take this as 200 billion or 2 × 10 11 stars and assume that our sun is a reasonable average size we can calculate that our galaxy contains about (1.2 × 10 56 ) × (2 × 10 11 ) = 2.4 × 10 67 atoms. The Hubble space telescope tells us that there are about 100 billion or 10 11 galaxies in the whole universe.