Straggler writes: Due to colour confinement quarks cannot exist in isolation. So we can only observe the hadrons (e.g. the neutron) they collectively form. |
And that bit means they are observed indirectly que no?
Straggler writes: So how do we detect the existence of black holes? |
Indirectly. I believe by observing the shit thats happening around them.

Straggler writes: We can’t observe the Big Bang either. And as I have pointed out above – Nor can you observe a quark. What we can do is observe the predicted effects of their existence. |
Cue the Eagles music:
Well Straggler when your traveling down a dark desert highway,
cool wind in your hair......and you see up ahead in the distance..
the lights from other cars on the same highway disappear and reappear you can conclude there is a hill up ahead without actually seeing the hill. Yes the effects of the hills existence. But we could go there and walk up that hill and see it does infact exist. I mean we know how light behaves, we know how gravity behaves, we can make observations that confirm with confidence the existance of what may be behind those observations.
CMB for the big bang, high energy collisions of hadrons for quarks, and light for black holes and hills.
Those are things that can be verified by experiment.
Straggler writes: It's not about size. It's all about verifiable predictions. |
Of which cannot be made at Planke scales as far as I know.
But I do agree Mr. Straggler strings theory is not supernatural.
God making strings, now that's supernatural.
"You were not there for the beginning. You will not be there for the end. Your knowledge of what is going on can only be superficial and relative" William S. Burroughs