Originally posted by moon1969
It is called observation and scientific method. But I guess the law of gravity is only a theory, and we will never know for sure and will never have full understanding and would be bad for us to claim knowledge that gravity exists.
That is total nonsense.
The existence of gravity is confirmed fact.
The exact strength of gravity and how it is generated and such is covered by the theory of gravity
which seeks to explain gravity and how it works and why it is.
But the fact of its existence is not open to question.
It obviously exists. It's observable, we observe it, we don't float off into space, it exists.
the existence of gravity is a fact.
The law of universal gravitation is a fact.
The theory of gravity (GR) is the current best explanation for and of gravity.
The theory might get altered and tweaked, but the existence of gravity is not in question.
If it's possible to claim anything as knowledge then it is possible to claim that gravity exists.