How many particle in the universe

Therefore the observable universe is defined as only the parts of the universe that are within This number would include the total of the number of protons, neutrons, neutrinos and electrons. Until we know what the dark matter particle is, we cannot make an accurate estimate of the number of dark matter particles.

We do know that the total mass of the dark matter is about 6 times the mass of the particles in the universe. Currently, the favored theoretical candidate for the dark matter particle is the WIMP - the weakly interacting massive particle. These particles are assumed to be much heavier x? We know even less about the dark energy in the universe, but the leading estimate is that it is "just" a small constant vacuum energy density.

If the dark energy is just vacuum energy, then that would not increase the particle count for the universe. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How many particles are there in the entire universe?

Asked 3 years, 8 months ago. Active 3 years, 8 months ago. Viewed 20k times. Stars come in different sizes, but a typical star, like the Sun , has a mass of around 2 x 10 30 kilograms.

Stars fuse lighter elements into heavier ones, but most of the mass of an active star consists of hydrogen. 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. Although 10 80 atoms is a good ballpark value for the number of atoms in the universe, other estimates exist, mainly based on different calculations of the size of the universe.

Another calculation is based on measurements of cosmic microwave background radiation. Overall, the estimates of the number of atoms range from between 10 78 to 10 82 atoms. Both of these estimates are large numbers, yet they are very different, indicating a significant degree of error. These estimates are based on hard data, so they are correct based on what we know. Revised estimates will be made as we learn more about the universe. Actively scan device characteristics for identification.

Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance. Select basic ads. Create a personalised ads profile. So how many are there? Or more than a vigintillion but less than a centillion.

So, pretty much incomprehensible. However, given the enormity of the universe, even that incomprehensible number doesn't fill up much of the total volume. If there are 3. The majority of space is, after all, empty space. Padilla takes his thought experiment one step further to estimate how long it would take humans, given the current rate of population expansion, to absorb every particle in the universe. For that, you are going to have to watch the video above, and the answer might surprise you.

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