**ABSTRACT**

By modifying the basic definition of cosmic red shift as [z/(1+z)], considering ‘speed of light’ as an absolute cosmic expansion rate, adopting ‘Planck mass’ as the basic seed of the observed large scale universe and following a scaled form of Hawking’s black hole temperature formula, it is certainly possible to review and revise the basic picture of ‘standard cosmology’ and in near future, a perfect model of ‘white hole cosmology’ can be developed. In this context we have developed five assumptions. Independent of matter density fractions, first assumption is helpful in understanding galactic red shifts and galactic light travel distances. Second and third assumptions are based on ‘time reversed’ black holes and seem to be well connected with General theory of relativity as well as Quantum mechanics. Fourth and fifth assumptions are helpful in understanding current galactic dark matter and flat rotation speeds. It may be noted that, considering our first three assumptions and considering the Planck Legacy 2018 data’s enhanced lensing amplitude in cosmic microwave background power spectra – conceptually, a closed universe having a positive curvature seems to be a best fit for the observed universe. With reference to our recent publication [26], for clarity on the subject, in this paper, we make an attempt to review and explain our proposed assumptions at fundamental level. Our aim is to see that, professional and non-professional cosmologists must understand the basics of workable quantum cosmology.

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