It depends on what the meaning of "gravity" is. Is there one thing that is "gravity", or was Newton's gravity a different thing than Aristotle's and Galileo's?
If you want to insist that there is only one thing called "gravity" it gets kind of metaphysical, because nobody has ever totally understood it yet.
I mean, I'm fine with that, as one can define "gravity" as what makes the Earth go around the Sun, etc., but it's not dependent on specific humans, or any humans, ever existing.
If you do associate the concept with human theories, then I think you have to allow for it not being the same concept to all.
I think it depends only on whether Aristotle, Galileo and Newton were all describing, or attempting to accurately describe, the identical phenomenon. And I believe it is self-evident that they were, what we all now call gravity. Saying Newton discovered gravity is like saying Edison discovered electricity. Obviously, at some point, Newton discovered, or technically, rediscovered gravity and worked out some properties of it with less error than anyone before him.
If you want to insist that there is only one thing called "gravity" it gets kind of metaphysical, because nobody has ever totally understood it yet.
I mean, I'm fine with that, as one can define "gravity" as what makes the Earth go around the Sun, etc., but it's not dependent on specific humans, or any humans, ever existing.
If you do associate the concept with human theories, then I think you have to allow for it not being the same concept to all.