According to our current understanding of quantum mechanics, it is not possible for every particle to be entangled with another. Entanglement is a phenomenon that occurs between pairs or groups of particles, where their quantum states become correlated in such a way that the state of one particle cannot be described independently of the state of the other(s). This entanglement is a fundamental aspect of quantum mechanics and has been experimentally verified.
However, entanglement does not occur between all particles in a system. In fact, entanglement typically arises due to specific interactions or processes that bring particles into a correlated state. For example, in certain experiments, pairs of particles can be entangled through a process called "quantum entanglement." This process involves the creation of two particles that have correlated properties, such as their spins or polarizations.
While entanglement can exist between specific particles, it does not mean that every particle in the universe is entangled with another. The entanglement between particles is usually a result of specific circumstances, interactions, or experimental setups. In the vast majority of cases, particles are not entangled with one another, and their behavior can be described independently using classical physics or statistical methods.