Is there a finite number of particles in the universe?

These can be created and destroyed during the processes of stellar evolution, and particularly photons, which are bosons, have no limit on their number at all. There is no limit to the number of particles currently or at any time after the Big Bang.

Are photons infinitely small?

Even though photons are waves, they have energy and from general relativity you can only have so much energy in a certain region up to a point where the energy density is so high that the region will collapse into a black hole. At this point the region will be infinitely dense and infinitely small.

How many photons can occupy the same space?

They’re bosons, and as a consequence of that they are not subject to the Pauli exclusion principle, so if you have a photon occupying some space (whatever that may mean), you can in theory pack an unlimited number of additional photons into the same space.

Do photons stop existing?

Photons move at the speed of light because they have no inherent mass to slow them down. Because they have no inherent mass, they can’t really be stopped per-se, because a photon that wasn’t moving would have no basis to even exist – really all a photon is depends on its movement.

What if photons have mass?

The speed of light is special: nothing with mass can move at that speed, or accelerate to it. If photons have mass, then obviously the “speed of light” becomes a misnomer. Massless particles would still travel at that speed — if any particles end up being massless after the carnage is done.

How many photons are in the universe?

Now, by using an indirect method, scientists have finally made this measurement. The team found that the amount of starlight, or the number of photons (particles of visible light) that stars have emitted throughout the history of the observable universe is 4×10^84 photons.

Do photons transfer energy?

The photon transfers a portion of its energy to the electron (assumed to be initially at rest), which is then known as a recoil electron, or a Compton electron. All angles of scattering are possible. The energy transferred to the electron can vary from zero to a large fraction of the gamma-ray energy.