According to our current understanding of physics, subatomic particles are the smallest known building blocks of matter. These particles, such as electrons, protons, and neutrons, make up atoms and interact with each other through fundamental forces.
However, it is important to note that our understanding of physics is continually evolving, and new discoveries can challenge existing theories. In the past, advancements in particle physics have revealed previously unknown particles and phenomena, so it is not possible to definitively rule out the existence of particles smaller than what we currently consider subatomic.
The field of particle physics explores the fundamental nature of matter and the forces that govern it. Experiments conducted at high-energy particle accelerators, such as the Large Hadron Collider (LHC), aim to probe deeper into the structure of matter and uncover any potential substructure or fundamental particles beyond what we currently know.
While there is no conclusive evidence or established theory suggesting the existence of smaller particles, future scientific advancements might bring new insights and challenges to our understanding of the fundamental nature of reality.