The smallest known spherical objects in the universe are subatomic particles. These particles are the building blocks of matter and include particles such as electrons, quarks, and neutrinos.
Electrons are elementary particles with a negative electric charge and a negligible mass. They are considered point-like particles with no internal structure or size. In other words, they are often treated as having no size at all, though they do possess properties such as charge and spin.
Quarks, on the other hand, are elementary particles that make up protons and neutrons, which are the building blocks of atomic nuclei. Quarks are also considered to be point-like particles with no known internal structure or size.
Neutrinos are extremely lightweight particles that have very little interaction with matter. They are also considered to have negligible mass and are often treated as point-like particles.
It's important to note that our understanding of particle physics and the nature of subatomic particles continues to evolve with ongoing scientific research. New discoveries and theories may refine our understanding of the smallest objects in the universe.