"substantiated explanation".
The big bang theory is not based on a "substantiated explanation". It is based on an assumption about the cosmic redshift. What we are really talking about are competing assumptions, which can only be "substantiated" by their consquences for our whole understanding of the process of the Universe.
Physics, by which I mean the abstractionist paradigm of establishment physics, will claim that space is a vacuum and then claim that it is composed of virtual particles, dark matter, and who know what next week.
As I seek a totally connected perspective of the Universe, I decided that space is composed of the emission of objects and that all objects have emission which forms a field around those objects.
If you read my essay you will see I've gone a let futher than that. See "Debunking Physics with a Materialist Perspective of the Universe", located at http://members.westnet.com.au/paradigm/materialist.pdf
When I realised that many of the assumptions of physics were wrong, I also realized that a new paradigm was needed for us to obtain a connected understanding of the Universe.
And, basically, that's where I'm presently at. Exploring the possibility of a new paradigm, a materialist paradigm, a typology which always begins with what we observe.
The big bang theory is wrong.
Physics can not measure cosmic distance with the redshift of the light from galaxies. You can not distingish between the distance and the luminosity of a object from the redshift of its light.
Physics claims that light does not change as it travels. Think about it. Light leaves a source and retains its wavelength as it travels. Complete nonsense.
Stephen