There were no gravitation experiments done beyond our solar system.  The information we have from beyond our solar system comes from huge telescopes that massively magnify extremely faint bits of light which we believe came from beyond our solar system. (If that light didn’t come from beyond our solar system where did it come from ?  That is unknown, but just because something is unknown doesn’t mean that the only explanation being offered to explain it is the correct explanation.  Over the years science has had many theories about the unreachable, which theories have later been found to be wrong.  To believe something to be correct because no-one can come up with a better theory is not science, it’s an exaggerated ego, believing that we (people) can know everything.)

What we have are super expensive telescopes receiving humanly unseeable bits of light and magnifying those bits of light to a massive extent.  To make matters even more sketchy those bits of light are believed to be tens to hundreds of years old.  No-one knows what happens to light over time.  The oldest verifiable source of origin light we ever see on Earth (even with the most expensive telescopes) is the Sun’s light that is reflected back by the planets, that light is not even one day old, therefore, we have no way of knowing what happens to light after years, after decades, after centuries; maybe nothing happens to it, but maybe it changes to such a great extent as to not be analyzable by us, no-one knows.  To add even more uncertainty, those hugely magnified faint bits of old light (if that's what they are) traveled through billions and trillions of miles of unknown territory in space, what might have happened to it on that journey, what might it have passed through that changed it before it reached our telestopes, is completely unknown.

Science then takes theories such as Relativity or Newton’s gravity theory, and applies them to those unknown unverifiable bits of light and comes up with explanations for what those bits of light mean.  Those theories have never, I repeat, never, been tested beyond our solar system.

Consequently, are there black holes, theoretically there could be, is there humongous gravitational lensing from beyond our galaxy, theoretically there could be; but to claim that it is a fact is not science.

Science claims that it is safe to assume that gravitation and matter and energy is the same everywhere in the universe; I say: (i) Is the arctic the same as the desert ? (ii) Is Jupiter the same as Neptune or Mars ? (iii) Is the mineral iron the same as the mineral gold ? (iii) Does the Moon rotate on its axis as does the Earth ? (iv) How many 100% identical trees have you seen, or dogs, or cars that don’t even have a one tenth of one percent difference from every other car, even cars made in the same factory on the same day; and on and on.  On Earth and in the universe differences are the normal.

My point is that a theoretical possibility, such as black holes and huge gravitational lensing is not a reality, it is a possibility.