👉 The "old fluid" refers to the primordial substance that existed before the formation of the universe as we know it today. This concept is rooted in cosmological theories, particularly those involving the Big Bang model, which posits that the universe began as an extremely hot and dense point approximately 13.8 billion years ago. The "old fluid" is often conceptualized as a hypothetical state of matter that preceded the universe's expansion and cooling, possibly involving exotic forms of energy or matter that are not yet fully understood by modern physics. This fluid is thought to have been the medium in which the universe's fundamental forces and particles interacted, eventually leading to the formation of atoms, stars, galaxies, and everything else we observe today. The exact nature of this "old fluid" remains a topic of intense research and debate among cosmologists and theoretical physicists.
