Baseless?? Let's see.
Prediction of microwave background radiation spectrum vs data collected decades after the prediction was made. The prediction requires physics to work upto 13 billion years into the past.
If the whole universe really did begin in a hot dense state, then it must have released a great deal of light. As the universe expanded its temperature would cool, but we should still see a blackbody spectrum radiating from every direction. It turns out that is exactly what we see.The data matches the curve exactly. I mean really exact. The error bars on the data are too small to plot on this graph, and the curve still fits.
Predictions of the power spectrum of the background radiation vs data collected years after the prediction. This requires physics to be the same upto a fraction of a second after the Big Bang.
In the figure below, I’ve not only plotted the observed power spectrum as data points, I’ve also plotted a theoretical curve that agrees with the data. This theoretical curve is the shape you’d expect for a universe that is 74% dark energy, 22% dark matter, 4% regular matter (stars, planets and us), and is about 13.7 billion years old. We have other ways of determining each of these values, and they agree with these values.The amazing thing is that all these values fit in this single curve. If the values were different the peaks would shift left or right, or be higher or lower. While the image of the CMB is wonderful, with its swirls of color, this graph is even more wonderful. It tells us that our understanding of the universe is on track.
https://briankoberlein.com/2013/10/13/ripples-on-the-cosmic-pond/
Prediction of element abundance of the universe, confirmed by astronomical observations 50 years after prediction. Requires laws of atomic physics to be same since a fraction of a second after Big Bang.
The Abundance of Light Elements
The last big prediction, the existence and features of the cosmic neutrino background, has been confirmed from observations in 2016 seventy years after the prediction was made.
https://www.forbes.com/sites/starts...big-bangs-last-great-prediction/#7b4a8f0130c7
The prediction of the neutrino background temperature was 1.95 K and the observation was 1.96 K with uncertainty of 0.02K.
Thus we see that by assuming uniformity of the laws of physics far back into the past till a millisecond after the Big Bang provides predictions of what can be observed today and the confirmation of these predictions with such accuracy provides excellent justification for our assumption of the uniformity of the laws of physics far far back into the past.
Can all observations match predictions exactly? Of course not. But neither do predictions of current phenomenon match experimental observations exactly. For laws always always makes simplification and do not capture every aspect of a phenomenon. In fact the matches above are far far better than many matches between theory and experiments in many fields of physics and chemistry.
For example even in 2017, there is 2-5% mismatch between theoretical predictions vs data of the burning products of a simple burner flame, and it's much greater for more complex flames in your car engines or airplanes. And still the physics is sufficient for planes and cars to work safely every single day.
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