Evidence for the Big Bang Theory (Universe had a begining) can be remembered by SURGE:
S - The Second Law of Thermodynamics
The universe is running out of usable energy
First Law = total amount of energy is constant
If the universe was eternal, then we would have ran out of usable energy by now
Second Law is also know as the Law of Entropy - nature tends to bring things to disorder
If the universe is becoming less ordered where did the original order come from?
U - The Universe is Expanding
Universe is not expanding into empty space, but space itself is also expanding
Time, space and matter came into existence at the Big Bang
If the universe is expanding, it would have to begin from a smaller space in the past
Those who believe the universe always exist
This assumes time and space existed before time and space
Atheist must believe that the matter of the universe came from nothing and by nothing
R - Radiation from the Big Bang
Cosmic background radiation, aka the afterglow from the Big Bang
Light and heat came from the initial explosion
This light is not visible by humans because its wavelength has been stretched by the expanding universe
Wavelength slightly shorter than microwave but we can see the heat via instrumentation