I am old enough to remember when the the Big Bang was not the accepted model of the universe. In the 1950’s there were two major theories: George Gamow’s Big Bang Universe and Fred Hoyle’s Steady State Universe. After evidence of the residual noise of the Big Bang discovered by Penzias and Wilson in 1964 appeared to confirm a single creation event, the Steady State Universe fell into disrepute. In the Big Bang Universe, everything that exists was created in the first few seconds of its 13.7 billion year history. On the other hand, the Steady State Universe is eternal. It has always existed and will always exist. As it expands, new matter is continuously created to keep the Universe in balance and in a “steady state.”
The Big Bang theory has much physical evidence to support it. The outward motion of the the galaxies seems to suggest an expanding universe, which would logically follow if everything originated at a single point. The idea that the four elemental forces, the strong nuclear force, the weak nuclear force, the electromagnetic force and the gravitational force were all created at the very beginning and thus were essential in defining the rules of the new universe fits nicely with some of the evidence produced by studies of subatomic particles (see previous blog). The Big Bang also has a psychological and social appeal: it is consistent with most of the creation myths posited by the religions of the world, and it is psychologically consistent with our own life cycle: birth, life, decay and eventual death. These appeals make it attractive to scientists, whether they choose to admit it or not, and probably explains their resistance to accepting data that seems to suggest flaws in the theory.
The measured rate of expansion of the universe, sometimes known as the Hubble constant, has been shown to be inconsistent with the estimated amount of matter and energy in the universe. Therefore, the proponents of the Big Bang have postulated that there is a large amount of matter and energy, known as dark matter, that exists, but is undetectable other than by inference from the prevailing theory. This explanation bears a close resemblance to those put forth by pre-Copernican scientists to explain retrograde motion and other measurements being made that seemed to suggest that an Earth centered, Ptolomeic universe was a flawed model. They postulated that the planets moved around the Earth and then also moved in mini-orbits called epicycles. Of course, within a few years this elaborate explanation came unraveled and a new version of the solar system emerged, along with a new way of looking at creation. Similarly, if the Big Bang was brand new and being suggested as a model with dark matter and energy built into that proposed model, I am certain it would be dismissed as ridiculous and overly elaborate. But because it is the conventional wisdom that the prevailing theory is the true model of creation and scientists are psychologically comfortable with this model, the postulated undetectable matter and energy is accepted.
Because the actors in history are people and people do not change, while scientific discoveries and fads may come and go, history cycles on repeating the same patterns. The Big Bang is getting long in the tooth as scientific theories go in the modern era and I suspect it will be coming unraveled soon. What replaces it will be interesting to see. Possibly some modified version of Hoyle’s eternal and infinite universe will re-emerge to explain the seemingly contradictory observations.