I don't mean this in a derogatory way, but your approach is really no different than if someone were to stand up and challenge the viability of mathematical practices such as trigonometry before they even bother to secure a comprehensive understanding of fundamentals such as properly counting to 10 and why 2+2=4.
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You ask this same question repeatedly. In one of them you referenced a website pushing the absolutely insane theory called the "electric universe". The fact that you buy into this fairy tale is proof that you are just profoundly ignorant, Until you get off the wacko sites and do some real study to learn some FACTS, nobody is going to listen to you, and I am pretty sure that you are being reported for trolling, which is really what you are doing. These moronic questions serve only demonstrate your ignorance.
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This sounds a lot like someone saying "How do you know there is air since you can't see it". Direct observation is not the only method we have for determining truth.
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If you choose to think that observations don't mean anything, that is your choice.
The reality is, whether you agree or not, that black holes exist.
Scientists don't observe the singularity, they observe the motions of objects near the black hole. It takes a lot of mass in a very small volume to toss stars around like observed in the center of our galaxy, or to launch relativistic radio jets as observed in other galaxies.
You obviously don't understand the concepts you are trying to argue against, and that is your choice. By choosing to argue against something without doing your research, you negate your entire argument.
The "photographs" are artists conceptions, not real photos - don't kids today understand the difference between fact and fiction?
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how do you prove any "hole" exists?
you prove it by observing the stuff around it stupid.