a matter of belief

Fifty to one hundred light years. Most of the stars that we can see with the unaided eye. That is how far away science can ‘prove’ that certain stars are. After that it is extrapolation - to infer (guess; speculate; surmise, conclude or judge from premises or evidence) an unknown from something that is known; conjecture; (the formation or expression of an opinion or theory without sufficient evidence for proof.) After fifty to a hundred light years measurement by parallax does not work any more, the angles are too small to accurately measure. It is possible that light is affected by gravity. Question. If you were to set up a telescope and point it at a star, how would you go about proving to me that it is where you say that it is? Suppose you claim that it is a mere ten billion light years away. OK. The light only has to swerve past one teeny tiny little bitty black hole half way here and viola it really is half a sky away from where your telle scope is pointed. And how are the chances that in ten billion light years it will only encounter One black hole? No matter how much you want to believe it …