This is the ultimate question of physics. To every particle there is an antiparticle. These particles seem to annihilate each other. For example, an electron is killed by a positron. According to the first commandment, energy can not be destroyed. So the annihilation radiation is a kind of energy.
Maybe this is a matter of belief rather than science. I believe something has always existed. The shape of the universe differs from time to time, but there is always a certain amount of energy present. Whether this is as a particle-antiparticle couple or as pure radiant energy, is the same. One clue may be the fatigue of em-radiation from the 'big bang'. When quanta get old, they become tired. If we believe in conservation of energy, we must explain this fatigue.
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ed. Religious people ask God the same question: "Why are we here?". Is this 'the ultimate question about life, the universe and everything'? Science deals with observation. So let's observe what happens when a neutrino meets an anti-neutrino! Then we can start the discussion.
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