TL;DR
This paper reviews the current evidence supporting the relativistic Big Bang model of cosmology, discusses philosophical perspectives in cosmological research, and highlights the intriguing behavior of certain galaxies as isolated universes.
Contribution
It provides a comprehensive analysis of cosmological tests confirming the Big Bang model and explores philosophical considerations and galaxy behaviors for future research.
Findings
Cosmological tests support the Big Bang model.
Some galaxies behave as island universes.
The network of tests is sufficiently tight to validate the model.
Abstract
The network of cosmological tests is tight enough now to show that the relativistic Big Bang cosmology is a good approximation to what happened as the universe expanded and cooled through light element production and evolved to the present. I explain why I reach this conclusion, comment on the varieties of philosophies informing searches for a still better cosmology, and offer an example for further study, the curious tendency of some classes of galaxies to behave as island universes.
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