perplexity said:
It is not logical to suppose that something is at the same time concluded and challengeable. The proposition is perverse. A case is either closed or open.
For example - we know the Earth orbits the sun.
We (in the UK at least)
know the sun rises in the East and sets in the West.
But let's examine what we actually mean by "know".
We have evidence that every day, since records began, the sun has risen in the East.
We have similar evidence that every day it has gone on to set in the West.
We have been able to generate a theory as to why - being orbital mechanics and the fact the Earth rotates around the Sun through the theory and Law of Gravity etc.
We have been able to test this theory - repeatedly.
So it is a REASONABLE ASSUMPTION that the sun will continue rising in the east etc.
But we can NOT know with absolute 100% surety that it will do.
It will take just ONE EXAMPLE of the Sun rising in the West and setting in the East - or any other non-normal combination of risings and settings - to dispute what we currently "know".
Therefore we have conclusive evidence, a working theory, and can sit happy with the comfortable and LOGICAL assumption that it will continue to do what it has done for the last x years.
But we can never say that it will ALWAYS be like that.
Nothing in science is 100% proven - as we can not know every unit of space-time. All we can say is that, based on the evidence... etc.
The more conclusive the evidence, the greater the probability that the next occurrence will be within expectation of the theory etc.
So, as stated: a probability of objective reality based on available evidence.