Origin of Our Universe and how it Likely Began.Description Mass/energy, and gravity unaffected by zero temperature were the most likely factors that created our universe, and may have always existed without change, since there is no sign they evolved after the Big Bang, although the finely tuned parameters might suggest an earlier period of evolution, but there is no evidence to support this.It appears completely impossible for anything, let alone something as complicated as mass/energy, to emerge extremely hot from an absolute zero temperature vacuum nothing, which had no trace of energy or matter, and no fields or virtual particles, unlike the present so called absolute vacuum, which infers mass/energy has always existed and is eternal. Our universe is not likely to be unique, and it appears to be just one among countless similar universes, present in space beyond our horizon. Their gravity explains dark energy's acceleration of our universe, and the apparent expansion of space, which makes our mass/energy and dark matter roughly 15.6% and 84.4%. The vast number of galaxies seen in early times support the idea that our Big Bang may have happened in space surrounded by other universes, which supplied the mass/energy from dead stars etc. for our Big Bang. The enormous mass of our Origin attracted galaxies from these surrounding universes to mix in with the mass/energy of our Origin, making it look as if the myriad of galaxies, observed, appeared to originate from our Big Bang, which they could not.A succession of frigid black hole collisions due to gravity not affected by cold temperature, produced heat followed by cooling between collisions, gradually building up to roughly half universe in size frigid black holes. Two eventually collided forming a cold fixed mass/energy Origin from their combined mass plus their collision energy. The collision caused the Origin to heat up and vigorously expand within an unobservable flexible boundary homogenizing its particles. If the collision is big enough a chain reaction will ensue resulting in an exponential temperature rise causing the 1/2 spin matter particles to unify with a loss of charge that resulted in matter and antimatter unifying. The gauge forces and Higgs joined the unification in a massless symmetry that caused the Origin's boundary to collapse and become observable at the capacious hot Big Bang, marking the start of time and allowing expanding particles to inflate at speeds faster than light, which made some parts of our horizon to be separated by a distance more than can be covered at the speed of light. The swiftness of inflationary expansion caused various matter residues to avoid unification so they could eliminate an equal large quantity of antimatter when the unified mass cooled rapidly by inflation, and separated into individual force and matter particles. No subtle difference between matter and antimatter exists that can otherwise explain our matter universe. There is no evidence that a supreme being that could create our universe ever existed. If there was any evidence religious faith would be unnecessary. All information about a god has been fabricated by human imagination. There is also no reason to believe that a Big Bang in other universes could result in parameters being different from our own. Other universes will most likely be similar to our universe in parameters and properties but different mainly in size, and in their stage of development, separated from other universes by the immense distances of space, but loosely linked together by gravity, but far removed from our observation, which produces the 'dark energy' acceleration that prevented our universe contracting in a big crunch. This Treatise based on 18 years of independent private study seems to solve the riddles of our Big Bang, including why the Hubble constant varies by up to 10% when checked in different ways.