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Seen another way, the photon can be considered as its own antiparticle.
An antiparticle can be thought of as a time reversed particle.
For every kind of particle there is a corresponding antiparticle.
When a particle is going backward in time, it's called an antiparticle.
You cannot say that the antiparticle will meet a corresponding particle.
I heard one estimate that there are only about 1 billion antiparticles around the entire planet.
The laws of physics seem to be the same for particles and antiparticles.
"And we'll need a way of directing the antiparticle stream.
"We're going to plug up the hole by shooting antiparticles at it?"
It was decommissioned along with the rest of the antiparticle factory in 1996.
Later, it became clear to physicists that every particle of matter had an associated antiparticle.
If moving very fast, a huge amount of energy, they will produce many different particles and antiparticles.
This means that the particle and antiparticle are different.
We now know that every particle has an antiparticle, with which it can annihilate.
The only difference is that the value of the energy is negative for the antiparticle.
For example an electron and its antiparticle, the positron, may be created.
It is furthermore possible (but not necessary) that neutrinos are their own antiparticle.
So we say that photon is its own antiparticle.
The laws of nature are very nearly symmetrical with respect to particles and antiparticles.
The cube worlds were antiparticles, moving back through time to initiate their own creation.
As a result, gravity is the same for both particles and for antiparticles.
The antiparticle of the electron is called a positron.
High energy processes in nature can create antiparticles.
Each particle has what is called an antiparticle.
When two antiparticles meet, they annihilate each other completely.