cannabineer
Ursus marijanus
Fin, I don't get it.
Are you objecting to the observability of black holes, or are you stating that there is no reason to believe that galactic objects massive/dense enough to wear an event horizon are real?
In re observability: can you see a hole? Take a knothole in a fence. What are you seeing? fence, with a spot where a defocused bit of the neighbor's back yard shows through. If I am allowed to wax philosophically picayune, you cannot see a hole. Even so, describing it as a hole makes cognitive and communicative sense. Nobody except an undergraduate phil. major on tripweed (imo!) would object to my pointing at the defect in the fence and calling it a hole, and saying "I see the hole".
As for black holes, I feel a similar convention applies. We cannot directly observe an event horizon or whatever is concealed "within" it. However we CAN observe essentially conclusive optical (from radio to gamma) "sign", unique consequences of masses great and compact enough to generate an event horizon. We can detect, image, otherwise characterize the optical distortions and particle effects characteristic of the screaming margin of spacetime just on our side of the horizon. Calling these attendant phenomena "black holes" is a verbal convention that I accept as sensible.
I don't know if I'm addressing your basic point, becaue I'll confess i'm having some trouble figuring it out. cn
Are you objecting to the observability of black holes, or are you stating that there is no reason to believe that galactic objects massive/dense enough to wear an event horizon are real?
In re observability: can you see a hole? Take a knothole in a fence. What are you seeing? fence, with a spot where a defocused bit of the neighbor's back yard shows through. If I am allowed to wax philosophically picayune, you cannot see a hole. Even so, describing it as a hole makes cognitive and communicative sense. Nobody except an undergraduate phil. major on tripweed (imo!) would object to my pointing at the defect in the fence and calling it a hole, and saying "I see the hole".
As for black holes, I feel a similar convention applies. We cannot directly observe an event horizon or whatever is concealed "within" it. However we CAN observe essentially conclusive optical (from radio to gamma) "sign", unique consequences of masses great and compact enough to generate an event horizon. We can detect, image, otherwise characterize the optical distortions and particle effects characteristic of the screaming margin of spacetime just on our side of the horizon. Calling these attendant phenomena "black holes" is a verbal convention that I accept as sensible.
I don't know if I'm addressing your basic point, becaue I'll confess i'm having some trouble figuring it out. cn