The origin of the first subatomic particle is a topic of scientific speculation and ongoing research. According to our current understanding of the early universe, the first subatomic particles emerged during a period known as the Big Bang.
The Big Bang theory proposes that the universe began as a singularity, an extremely hot and dense state. As the universe expanded and cooled, the conditions allowed for the formation of elementary particles, such as quarks and leptons, which are considered the building blocks of matter. These particles combined to form more complex structures, such as protons and neutrons.
In the early stages of the universe, the energy was so high that particles and their corresponding antiparticles were being created and annihilated continuously. However, as the universe continued to expand and cool, a process known as baryogenesis is thought to have occurred, resulting in an excess of matter particles over antimatter particles. This asymmetry allowed particles to survive and form the matter we observe today.
It's important to note that our understanding of the early universe is based on theoretical models and experimental observations. While significant progress has been made in understanding the origins of subatomic particles, there are still unanswered questions and ongoing scientific investigations in this field.