A lot what we take as scientific facts are just the most approved theory for the particular scenario. There is so much that we don't actually know of especially in the far ends of the physical world that we can only estimate the best guess and make a theory out of it that works on all observed cases. If the theory doesn't work for some new observation then it's time to update that theory (after repeating the observation to make sure that wasn't a fluke).
A good example is the age of our universe. Most of us "know" that the age of our universe is 13,7 billion years. That's the best estimate verified only as recently as 2021 when the calculations showed it should be 13,787 years (+/- 0,02 billion years) according to Lambda-CDM concordance model.
Recently, mostly thanks to data from JWST there has been some new evidence that suggest the current estimate might be grossly wrong. The new theory suggest the age of the universe might be almost twice as old as previously thought at 26,7 billion years.
Even if this new measurement turns out to be "true" there is no way for us to prove it. We just need to believe in it. Until the next, more refined theory with better proof comes along.