Actually - that is a photo proving gravity. Without the Earth’s gravitational pull the space station would have flung out of orbit.
I knew a guy that built commercial, high-grade gravity meters. The Air Force had him investigate possible “anti-gravity” forces to account for long-range missiles being off-course. He thought that it was possible, but was never able to measure such anti-gravity forces. Or - that’s just what he told me! ;)
It would not surprise me if there are.
And WHAT would cause it to be flung out of orbit ? What keeps it from crashing into the Earth ?