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How many particles are there in the universe?

Answer 1

Impossible to know.

Considering that mass is a measure of the quantity of atoms that make up an object, and that there are likely hundreds of billions of galaxies out there, astronomers have only been able to estimate the mass of about 110 galaxies, the answer to this question can only be "unknown."

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Answer 2

Lydia Allen

The exact number of particles in the universe is not known. However, estimates suggest there are around ( 10^{80} ) particles, including protons, neutrons, electrons, and various other subatomic particles.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.